Terms and Concepts
1.1.3.2.
Answer.
\(\text{an indeterminate form}\)
1.1.3.3.
Answer.
\(\text{False}\)
1.1.3.6.
Answer.
\(1\)
Appendix A Answers to Selected Exercises
I Math 1560: Calculus I
1 Limits
1.1 An Introduction To Limits
1.1.3 Exercises
Problems
1.1.3.7.
Answer.
\(5\)
1.1.3.8.
Answer.
\(3\)
1.1.3.9.
Answer.
\(\text{DNE}\)
1.1.3.10.
Answer.
\({\frac{2}{3}}\)
1.1.3.11.
Answer.
\(-4\)
1.1.3.12.
Answer.
\(\text{DNE}\hbox{ or }\infty \)
1.1.3.13.
Answer.
\(\text{DNE}\)
1.1.3.14.
Answer.
\(6\)
1.1.3.15.
Answer.
\(1\)
1.1.3.16.
Answer.
\(\text{DNE}\)
1.1.3.17.
Answer.
\(1\)
1.1.3.18.
Answer.
\(\text{DNE}\)
1.1.3.19.
Answer.
\(\text{DNE}\)
1.1.3.20.
Answer.
\(1\)
1.1.3.21.
Answer.
\(-7\)
1.1.3.22.
Answer.
\(9\)
1.1.3.23.
Answer.
\(5\)
1.1.3.24.
Answer.
\(-0.111111\)
1.1.3.25.
Answer.
\(29\)
1.1.3.26.
Answer.
\(0.2\)
1.1.3.27.
Answer.
\(-1\)
1.1.3.28.
Answer.
\(0\)
1.2 Epsilon-Delta Definition of a Limit
Exercises
Terms and Concepts
1.2.2.
Answer.
\(\text{y-tolerance}\)
1.2.3.
Answer.
\(\text{True}\)
1.2.4.
Answer.
\(\text{True}\)
1.3 Finding Limits Analytically
Exercises
Terms and Concepts
1.3.6.
Answer.
\(\text{True}\)
Problems
1.3.7.
Answer.
\(9\)
1.3.8.
Answer.
\(6\)
1.3.9.
Answer.
\(0\)
1.3.10.
Answer.
\(\text{DNE}\)
1.3.11.
Answer.
\(3\)
1.3.12.
Answer.
\(\text{not possible to know}\)
1.3.13.
Answer.
\(3\)
1.3.14.
Answer.
\(-45\)
1.3.15.
Answer.
\(0\)
1.3.16.
Answer.
\(\cos\mathopen{}\left(3.14159\right)\)
1.3.17.
Answer.
\(\pi \)
1.3.18.
Answer.
\(1\)
1.3.19.
Answer.
\(23\)
1.3.20.
Answer.
\(\left(\frac{\pi -5}{\pi -8}\right)^{4}\)
1.3.21.
Answer.
\(\frac{\sqrt{3}}{4}\)
1.3.22.
Answer.
\(-{\frac{16}{5}}\)
1.3.23.
Answer.
\(\text{DNE}\)
1.3.24.
Answer.
\(256\)
1.3.25.
Answer.
\(\frac{2\sqrt{3}}{3}\)
1.3.26.
Answer.
\(\ln\mathopen{}\left(4\right)\)
1.3.27.
Answer.
\(\frac{\pi ^{2}-4\pi -2}{2\pi ^{2}-2\pi +1}\)
1.3.28.
Answer.
\(\frac{2\pi -4}{5\pi -5}\)
1.3.29.
Answer.
\({\frac{1}{4}}\)
1.3.30.
Answer.
\(-{\frac{7}{2}}\)
1.3.31.
Answer.
\({\frac{17}{4}}\)
1.3.32.
Answer.
\({\frac{13}{3}}\)
1.3.33.
Answer.
\({\frac{4}{9}}\)
1.3.34.
Answer.
\({\frac{5}{4}}\)
1.3.35.
Answer.
\(0\)
1.3.36.
Answer.
\(0\)
1.3.37.
Answer.
\(1\)
1.3.38.
Answer.
\(9\)
1.3.39.
Answer.
\(8\)
1.3.40.
Answer.
\({\frac{9}{8}}\)
1.3.41.
Answer.
\(1\)
1.3.42.
Answer.
\(\frac{\pi }{180}\)
1.4 One-Sided Limits
Exercises
Terms and Concepts
1.4.2.
Answer.
\(\text{False}\)
1.4.3.
Answer.
\(\text{False}\)
1.4.4.
Answer.
\(\text{True}\)
Problems
1.4.5.
Answer.
\(2\)
Answer.
\(2\)
Answer.
\(2\)
Answer.
\(1\)
Answer.
\(\text{DNE}\)
Answer.
\(4\)
1.4.6.
Answer.
\(0\)
Answer.
\(4\)
Answer.
\(\text{DNE}\)
Answer.
\(4\)
Answer.
\(\text{DNE}\)
Answer.
\(1\)
1.4.7.
Answer.
\(\text{DNE}\hbox{ or }\infty \)
Answer.
\(\text{DNE}\hbox{ or }\infty \)
Answer.
\(\text{DNE}\hbox{ or }\infty \)
Answer.
\(\text{DNE}\)
Answer.
\(5\)
Answer.
\(4\)
1.4.8.
Answer.
\(2\)
Answer.
\(3\)
Answer.
\(\text{DNE}\)
Answer.
\(4\)
1.4.9.
Answer.
\(1\)
Answer.
\(1\)
Answer.
\(1\)
Answer.
\(1\)
1.4.10.
Answer.
\(-5\)
Answer.
\(1\)
Answer.
\(\text{DNE}\)
Answer.
\(3\)
1.4.11.
Answer.
\(2\)
Answer.
\(2\)
Answer.
\(2\)
Answer.
\(0\)
Answer.
\(2\)
Answer.
\(2\)
Answer.
\(2\)
Answer.
\(\text{DNE}\)
1.4.12.
Answer.
\(a-1\)
Answer.
\(a\)
Answer.
\(\text{DNE}\)
Answer.
\(a\)
1.4.13.
Answer.
\(2\)
Answer.
\(6\)
Answer.
\(\text{DNE}\)
Answer.
\(2\)
1.4.14.
Answer.
\(-17\)
Answer.
\(0\)
Answer.
\(\text{DNE}\)
Answer.
\(0\)
1.4.15.
Answer.
\(9\)
Answer.
\(9\)
Answer.
\(9\)
Answer.
\(9\)
Answer.
\(126\)
Answer.
\(126\)
Answer.
\(126\)
Answer.
\(126\)
1.4.16.
Answer.
\(-1\)
Answer.
\(0\)
Answer.
\(\text{DNE}\)
Answer.
\(0\)
1.4.17.
Answer.
\(1-\cos^{2}\mathopen{}\left(a\right)\)
Answer.
\(\sin^{2}\mathopen{}\left(a\right)\)
Answer.
\(1-\cos^{2}\mathopen{}\left(a\right)\hbox{ or }\sin^{2}\mathopen{}\left(a\right)\)
Answer.
\(\sin^{2}\mathopen{}\left(a\right)\)
1.4.18.
Answer.
\(0\)
Answer.
\(1\)
Answer.
\(\text{DNE}\)
Answer.
\(-2\)
1.4.19.
Answer.
\(-4\)
Answer.
\(-4\)
Answer.
\(-4\)
Answer.
\(-2\)
1.4.20.
Answer.
\(c\)
Answer.
\(c\)
Answer.
\(c\)
Answer.
\(c\)
1.4.21.
Answer.
\(-1\)
Answer.
\(1\)
Answer.
\(\text{DNE}\)
Answer.
\(0\)
1.5 Continuity
Exercises
Terms and Concepts
1.5.5.
Answer.
\(\text{False}\)
1.5.6.
Answer.
\(\text{True}\)
1.5.7.
Answer.
\(\text{True}\)
1.5.8.
Answer.
\(\text{False}\)
1.5.9.
Answer.
\(\text{False}\)
1.5.10.
Answer.
\(\text{True}\)
Problems
1.5.11.
Answer.
\(\text{No.}\)
1.5.12.
Answer.
\(\text{No.}\)
1.5.13.
Answer.
\(\text{No.}\)
1.5.14.
Answer.
\(\text{Yes.}\)
1.5.15.
Answer.
\(\text{Yes.}\)
1.5.16.
Answer.
\(\text{Yes.}\)
1.5.17.
Answer 1.
\(\text{No.}\)
Answer 2.
\(\text{Yes.}\)
Answer 3.
\(\text{No.}\)
1.5.18.
Answer.
\(\text{Yes.}\)
1.5.19.
Answer.
\(\text{Yes.}\)
Answer.
\(\text{Yes.}\)
1.5.20.
Answer.
\(\text{Yes.}\)
Answer.
\(\text{No.}\)
1.5.21.
Answer.
\(\text{Yes.}\)
Answer.
\(\text{Yes.}\)
1.5.22.
Answer.
\(\text{Yes.}\)
Answer.
\(\text{No.}\)
1.5.23.
Answer.
\(\left(-\infty ,\infty \right)\)
1.5.24.
Answer.
\(\left(-\infty ,-2\right], \left[2,\infty \right)\)
1.5.25.
Answer.
\(\left[-2,2\right]\)
1.5.26.
Answer.
\(\left[-3,3\right]\)
1.5.27.
Answer.
\(\left(-\infty ,-1.73205\right], \left[1.73205,\infty \right)\)
1.5.28.
Answer.
\(\left(-7,7\right)\)
1.5.29.
Answer.
\(\left(-\infty ,\infty \right)\)
1.5.30.
Answer.
\(\left(-\infty ,\infty \right)\)
1.5.31.
Answer.
\(\left(0,\infty \right)\)
1.5.32.
Answer.
\(\left(-\infty ,\infty \right)\)
1.5.33.
Answer.
\(\left(-\infty ,1.09861\right]\)
1.5.34.
Answer.
\(\left(-\infty ,\infty \right)\)
1.5.39.
Answer.
\(1.23633\)
1.5.40.
Answer.
\(0.523633\)
1.5.41.
Answer.
\(0.693164\)
1.5.42.
Answer.
\(0.785547\)
1.6 Limits Involving Infinity
1.6.4 Exercises
Terms and Concepts
1.6.4.1.
Answer.
\(\text{False}\)
1.6.4.2.
Answer.
\(\text{True}\)
1.6.4.3.
Answer.
\(\text{False}\)
1.6.4.4.
Answer.
\(\text{True}\)
1.6.4.5.
Answer.
\(\text{True}\)
Problems
1.6.4.9.
Answer.
\(-\infty \)
Answer.
\(\infty \)
1.6.4.10.
Answer.
\(-\infty \)
Answer.
\(\infty \)
Answer.
\(\text{DNE}\)
Answer.
\(\infty \)
Answer.
\(\infty \)
Answer.
\(\infty \)
1.6.4.11.
Answer.
\(0\)
Answer.
\(3\)
Answer.
\(1.5\)
Answer.
\(1.5\)
1.6.4.12.
Answer.
\(\text{DNE}\)
Answer.
\(\text{DNE}\)
Answer.
\(0\)
Answer.
\(0\)
1.6.4.13.
Answer.
\(\text{DNE}\)
Answer.
\(\text{DNE}\)
1.6.4.14.
Answer.
\(-9\)
Answer.
\(\infty \)
1.6.4.15.
Answer.
\(-\infty \)
Answer.
\(\infty \)
Answer.
\(\text{DNE}\)
1.6.4.16.
Answer.
\(-\infty \)
Answer.
\(-\infty \)
Answer.
\(-\infty \)
1.6.4.17.
Answer.
\(\infty \)
Answer.
\(\infty \)
Answer.
\(\infty \)
1.6.4.18.
Answer.
\(1.8\)
Answer.
\(1.8\)
Answer.
\(1.8\)
1.6.4.19.
Answer.
\(y = 2, x = -2, x = 9\)
1.6.4.20.
Answer.
\(y = \frac{5}{-2}, x = -9\)
1.6.4.21.
Answer.
\(y = 0, x = 0, x = 4\)
1.6.4.22.
Answer.
\(x = -3\)
1.6.4.23.
Answer.
\(\text{NONE}\)
1.6.4.24.
Answer.
\(y = \frac{4}{-1}\)
1.6.4.25.
Answer.
\(\infty \)
1.6.4.26.
Answer.
\(\infty \)
1.6.4.27.
Answer.
\(\infty \)
1.6.4.28.
Answer.
\(\infty \)
2 Derivatives
2.1 Instantaneous Rates of Change: The Derivative
2.1.3 Exercises
Terms and Concepts
2.1.3.1.
Answer.
\(\text{True}\)
2.1.3.2.
Answer.
\(\text{True}\)
Problems
2.1.3.7.
Answer.
\(0\)
2.1.3.8.
Answer.
\(2\)
2.1.3.9.
Answer.
\(-3\)
2.1.3.10.
Answer.
\(2x\)
2.1.3.11.
Answer.
\(3x^{2}\)
2.1.3.12.
Answer.
\(6x-1\)
2.1.3.13.
Answer.
\(\frac{-1}{x^{2}}\)
2.1.3.14.
Answer.
\(\frac{-1}{\left(s-2\right)^{2}}\)
2.1.3.15.
Answer 1.
\(y = 6\)
Answer 2.
\(x = -2\)
2.1.3.16.
Answer 1.
\(y-2x = 0\)
Answer 2.
\(0.5x+y = 7.5\)
2.1.3.17.
Answer 1.
\(3x+y = 4\)
Answer 2.
\(y-0.333333x = -19.3333\)
2.1.3.18.
Answer 1.
\(y-4x = -4\)
Answer 2.
\(0.25x+y = 4.5\)
2.1.3.19.
Answer 1.
\(y-48x = -128\)
Answer 2.
\(0.0208333x+y = 64.0833\)
2.1.3.20.
Answer 1.
\(7x+y = 1\)
Answer 2.
\(y-0.142857x = 8.14286\)
2.1.3.21.
Answer 1.
\(0.25x+y = -1\)
Answer 2.
\(y-4x = 7.5\)
2.1.3.22.
Answer 1.
\(x+y = 4\)
Answer 2.
\(y-x = -2\)
2.1.3.23.
Answer.
\(5.9x+y = 1.2\)
2.1.3.24.
Answer.
\(y-11.1111x = 110\)
2.1.3.25.
Answer.
\(y-0.0192627x = 0.0953664\)
2.1.3.26.
Answer.
\(0.04996x+y = 1\)
2.1.3.27.
Answer.
\(-2, 0, 4\)
Answer.
\(2x\)
Answer.
\(-2, 0, 4\)
2.1.3.28.
Answer.
\(-1, -0.25\)
Answer.
\(\frac{-1}{\left(x+1\right)^{2}}\)
Answer.
\(-1, -0.25\)
2.1.3.33.
Answer 1.
\(\left(-2,0\right)\cup \left(2,\infty \right)\)
Answer 2.
\(\left(-\infty ,-2\right)\cup \left(0,2\right)\)
Answer 3.
\(\left\{-2,0,2\right\}\)
Answer 4.
\(\left(-1,1\right)\)
Answer 5.
\(\left(-\infty ,-1\right)\cup \left(1,\infty \right)\)
Answer 6.
\(\left\{-1,1\right\}\)
2.1.3.34.
Answer 1.
\(\left(-2,2\right)\)
Answer 2.
\(\left(-\infty ,-2\right)\cup \left(2,\infty \right)\)
Answer 3.
\(\left\{-2,2\right\}\)
Answer 4.
\(\left(-1,0\right)\cup \left(1,\infty \right)\)
Answer 5.
\(\left(-\infty ,-1\right)\cup \left(0,1\right)\)
Answer 6.
\(\left\{-1,0,1\right\}\)
2.1.3.35.
Answer.
\(\text{no}\)
2.1.3.36.
Answer.
\(\text{yes}\)
2.2 Interpretations of the Derivative
2.2.5 Exercises
Terms and Concepts
2.2.5.1.
Answer.
\(\text{velocity}\)
2.2.5.3.
Answer.
\(\text{linear functions}\)
Problems
2.2.5.4.
Answer.
\(20\)
2.2.5.5.
Answer.
\(-89\)
2.2.5.6.
Answer.
\(91\)
2.2.5.7.
Answer.
\(\text{f(10.1)}\)
2.2.5.8.
Answer.
\(-2\)
2.2.5.9.
Answer.
\(7\)
2.2.5.10.
Answer.
\(\text{decibels per customer}\)
2.2.5.11.
Answer.
\(\text{foot per second squared}\)
2.2.5.12.
Answer.
\(\text{foot per hour}\)
2.2.5.15.
Answer.
\(\text{f is the derivative of g.}\)
2.2.5.16.
Answer.
\(\text{g is the derivative of f.}\)
2.2.5.17.
Answer.
\(\text{g is the derivative of f.}\)
2.2.5.18.
Answer.
\(\text{g is the derivative of f.}\)
2.3 Basic Differentiation Rules
2.3.3 Exercises
Terms and Concepts
2.3.3.1.
Answer.
\(\text{the power rule}\)
2.3.3.2.
Answer.
\(\frac{1}{x}\)
2.3.3.3.
Answer.
\(e^{x}\)
2.3.3.4.
Answer.
\(10\)
2.3.3.5.
Answer.
\(\text{Choice 1, Choice 2, Choice 5, Choice 6}\)
2.3.3.7.
Answer.
\(17x-205\)
2.3.3.9.
Answer 1.
\(\text{a velocity function}\)
Answer 2.
\(\text{an acceleration function}\)
2.3.3.10.
Answer.
\(\text{pound per foot squared}\)
Problems
2.3.3.11.
Answer.
\(-\left(14x+8\right)\)
2.3.3.12.
Answer.
\(28x-48x^{2}+5\)
2.3.3.13.
Answer.
\(9-\left(20t^{4}+{\frac{3}{4}}t^{2}\right)\)
2.3.3.14.
Answer.
\(19\sin\mathopen{}\left(\theta\right)-3\cos\mathopen{}\left(\theta\right)\)
2.3.3.15.
Answer.
\(3e^{r}\)
2.3.3.16.
Answer.
\(21t^{2}+5\sin\mathopen{}\left(t\right)-2\cos\mathopen{}\left(t\right)\)
2.3.3.17.
Answer.
\(\frac{6}{x}+9\)
2.3.3.18.
Answer.
\(s^{3}+s^{2}+s+1\)
2.3.3.19.
Answer.
\(\sin\mathopen{}\left(t\right)-\left(e^{t}+\cos\mathopen{}\left(t\right)\right)\)
2.3.3.20.
Answer.
\(\frac{8}{x}\)
2.3.3.21.
Answer.
\(0\)
2.3.3.22.
Answer.
\(18t+24\)
2.3.3.23.
Answer.
\(24x^{2}+96x+96\)
2.3.3.24.
Answer.
\(3x^{2}+18x+27\)
2.3.3.25.
Answer.
\(8x+28\)
2.3.3.27.
Answer 1.
\(9x^{8}\)
Answer 2.
\(9\cdot 8x^{7}\)
Answer 3.
\(9\cdot 8\cdot 7x^{6}\)
Answer 4.
\(9\cdot 8\cdot 7\cdot 6x^{5}\)
2.3.3.28.
Answer 1.
\(-8\sin\mathopen{}\left(x\right)\)
Answer 2.
\(-\left(8\cos\mathopen{}\left(x\right)\right)\)
Answer 3.
\(8\sin\mathopen{}\left(x\right)\)
Answer 4.
\(8\cos\mathopen{}\left(x\right)\)
2.3.3.29.
Answer 1.
\(-\left(4\cdot 2t+3+e^{t}\right)\)
Answer 2.
\(-\left(8+e^{t}\right)\)
Answer 3.
\(-e^{t}\)
Answer 4.
\(-e^{t}\)
2.3.3.30.
Answer 1.
\(2\theta+8\theta^{7}\)
Answer 2.
\(2+8\cdot 7\theta^{6}\)
Answer 3.
\(8\cdot 7\cdot 6\theta^{5}\)
Answer 4.
\(8\cdot 7\cdot 6\cdot 5\theta^{4}\)
2.3.3.31.
Answer 1.
\(-\left(\cos\mathopen{}\left(\theta\right)-\sin\mathopen{}\left(\theta\right)\right)\)
Answer 2.
\(\sin\mathopen{}\left(\theta\right)+\cos\mathopen{}\left(\theta\right)\)
Answer 3.
\(\cos\mathopen{}\left(\theta\right)-\sin\mathopen{}\left(\theta\right)\)
Answer 4.
\(-\left(\sin\mathopen{}\left(\theta\right)+\cos\mathopen{}\left(\theta\right)\right)\)
2.3.3.32.
Answer 1.
\(0\)
Answer 2.
\(0\)
Answer 3.
\(0\)
Answer 4.
\(0\)
2.3.3.33.
Answer 1.
\(y = 20\mathopen{}\left(x-2\right)+24\)
Answer 2.
\(y = -{\frac{1}{20}}\mathopen{}\left(x-2\right)+24\)
2.3.3.34.
Answer 1.
\(y = e^{0}\ln\mathopen{}\left(e\right)\mathopen{}\left(t-0\right)+e^{0}-2\)
Answer 2.
\(y = \frac{-1}{e^{0}\ln\mathopen{}\left(e\right)}\mathopen{}\left(t-0\right)+e^{0}-2\)
2.3.3.35.
Answer 1.
\(y = x-1\)
Answer 2.
\(y = -\left(x-1\right)\)
2.3.3.36.
Answer 1.
\(y = \frac{4\sqrt{3}}{2}\mathopen{}\left(x-\frac{\pi }{6}\right)+\frac{4\cdot 1}{2}\)
Answer 2.
\(y = -\left({\frac{1}{4}}\frac{2\sqrt{3}}{3}\right)\mathopen{}\left(x-\frac{\pi }{6}\right)+\frac{4\cdot 1}{2}\)
2.3.3.37.
Answer 1.
\(y = \frac{2\cdot 1}{2}\mathopen{}\left(x-\frac{\pi }{6}\right)+\frac{-2\sqrt{3}}{2}\)
Answer 2.
\(y = -\left({\frac{1}{2}}\cdot 2\right)\mathopen{}\left(x-\frac{\pi }{6}\right)+\frac{-2\sqrt{3}}{2}\)
2.3.3.38.
Answer 1.
\(y = 9-9x\)
Answer 2.
\(y = \frac{-1}{-9}\mathopen{}\left(x-\left(-9\right)\right)+90\)
2.4 The Product and Quotient Rules
Exercises
Terms and Concepts
2.4.1.
Answer.
\(\text{False}\)
2.4.2.
Answer.
\(\text{False}\)
2.4.3.
Answer.
\(\text{True}\)
2.4.4.
Answer.
\(\text{the quotient rule}\)
2.4.5.
Answer.
\(\text{False}\)
Problems
2.4.15.
Answer.
\(\sin\mathopen{}\left(y\right)+y\cos\mathopen{}\left(y\right)\)
2.4.16.
Answer.
\(3t^{2}\cos\mathopen{}\left(t\right)-t^{3}\sin\mathopen{}\left(t\right)\)
2.4.17.
Answer.
\(e^{q}\ln\mathopen{}\left(q\right)+e^{q}\frac{1}{q}\)
2.4.18.
Answer.
\(-\left(\frac{6y^{5}}{\left(y^{6}\right)^{2}}\mathopen{}\left(\csc\mathopen{}\left(y\right)-5\right)+\frac{1}{y^{6}}\csc\mathopen{}\left(y\right)\cot\mathopen{}\left(y\right)\right)\)
2.4.19.
Answer.
\(\frac{t-4-\left(t+8\right)}{\left(t-4\right)^{2}}\)
2.4.20.
Answer.
\(\frac{3q^{2}\mathopen{}\left(\sin\mathopen{}\left(q\right)-8q^{2}\right)-q^{3}\mathopen{}\left(\cos\mathopen{}\left(q\right)-8\cdot 2q\right)}{\left(\sin\mathopen{}\left(q\right)-8q^{2}\right)^{2}}\)
2.4.21.
Answer.
\(-\left(\csc\mathopen{}\left(y\right)\cot\mathopen{}\left(y\right)+e^{y}\right)\)
2.4.22.
Answer.
\(\sec^{2}\mathopen{}\left(t\right)\ln\mathopen{}\left(t\right)+\frac{1}{t}\tan\mathopen{}\left(t\right)\)
2.4.23.
Answer.
\(7\cdot 2q-6\)
2.4.24.
Answer.
\(5y^{4}\)
2.4.25.
Answer.
\(\left(5r^{2}+17r+10\right)e^{r}\)
2.4.26.
Answer.
\(\frac{9z^{8}-z^{9}-z^{5}+5z^{4}}{e^{z}}\)
2.4.27.
Answer.
\(3\)
2.4.28.
Answer.
\(5r^{4}\mathopen{}\left(\tan\mathopen{}\left(r\right)+e^{r}\right)+r^{5}\mathopen{}\left(\sec^{2}\mathopen{}\left(r\right)+e^{r}\right)\)
2.4.29.
Answer.
\(\frac{\csc\mathopen{}\left(z\right)\sin\mathopen{}\left(z\right)-\csc\mathopen{}\left(z\right)\cot\mathopen{}\left(z\right)\mathopen{}\left(\cos\mathopen{}\left(z\right)+2\right)}{\left(\cos\mathopen{}\left(z\right)+2\right)^{2}}\)
2.4.30.
Answer.
\(4\theta^{3}\sec\mathopen{}\left(\theta\right)+\theta^{4}\sec\mathopen{}\left(\theta\right)\tan\mathopen{}\left(\theta\right)+\frac{\sec\mathopen{}\left(\theta\right)\tan\mathopen{}\left(\theta\right)\theta^{4}-4\theta^{3}\sec\mathopen{}\left(\theta\right)}{\left(\theta^{4}\right)^{2}}\)
2.4.31.
Answer.
\(\frac{\tan\mathopen{}\left(r\right)-r\sec^{2}\mathopen{}\left(r\right)}{\tan^{2}\mathopen{}\left(r\right)}-\frac{\csc^{2}\mathopen{}\left(r\right)r+\cot\mathopen{}\left(r\right)}{r^{2}}\)
2.4.32.
Answer.
\(0\)
2.4.33.
Answer.
\(7\cdot 5x^{4}e^{x}+7x^{5}e^{x}-\left(\cos\mathopen{}\left(x\right)\cos\mathopen{}\left(x\right)-\sin\mathopen{}\left(x\right)\sin\mathopen{}\left(x\right)\right)\)
2.4.34.
Answer.
\(\frac{\left(2r\sin\mathopen{}\left(r\right)+r^{2}\cos\mathopen{}\left(r\right)\right)\mathopen{}\left(r^{2}\cos\mathopen{}\left(r\right)-9\right)-\left(r^{2}\sin\mathopen{}\left(r\right)-7\right)\mathopen{}\left(2r\cos\mathopen{}\left(r\right)-r^{2}\sin\mathopen{}\left(r\right)\right)}{\left(r^{2}\cos\mathopen{}\left(r\right)-9\right)^{2}}\)
2.4.35.
Answer.
\(\left(4z^{3}\ln\mathopen{}\left(z\right)+z^{4}\frac{1}{z}\right)\cos\mathopen{}\left(z\right)-z^{4}\ln\mathopen{}\left(z\right)\sin\mathopen{}\left(z\right)\)
2.4.36.
Answer.
\(\left(9\cos\mathopen{}\left(x\right)-9x\sin\mathopen{}\left(x\right)\right)\tan\mathopen{}\left(x\right)+9x\cos\mathopen{}\left(x\right)\sec^{2}\mathopen{}\left(x\right)\)
2.4.37.
Answer 1.
\(y = -\left(7x+7\right)\)
Answer 2.
\(y = \left({\frac{1}{7}}\right)x-7\)
2.4.38.
Answer 1.
\(y = 5.0345\mathopen{}\left(x-\frac{5\pi }{3}\right)+\frac{5\pi }{6}\)
Answer 2.
\(y = \frac{5\pi }{6}-\left({\frac{12837432}{64630031}}\right)\mathopen{}\left(x-\frac{5\pi }{3}\right)\)
2.4.39.
Answer 1.
\(y = -\left(15\mathopen{}\left(x+5\right)+25\right)\)
Answer 2.
\(y = \left({\frac{1}{15}}\right)\mathopen{}\left(x+5\right)-25\)
2.4.40.
Answer 1.
\(y = \left({\frac{1}{8}}\right)x\)
Answer 2.
\(y = -8x\)
2.4.41.
Answer.
\({\frac{17}{2}}\)
2.4.42.
Answer.
\(0\)
2.4.43.
Answer.
\(\text{NONE}\)
2.4.44.
Answer.
\(0, 4\)
2.4.45.
Answer.
\(2\cos\mathopen{}\left(x\right)-x\sin\mathopen{}\left(x\right)\)
2.4.46.
Answer.
\(-4\cos\mathopen{}\left(x\right)+x\sin\mathopen{}\left(x\right)\)
2.4.47.
Answer.
\(\csc\mathopen{}\left(x\right)\cot\mathopen{}\left(x\right)\cot\mathopen{}\left(x\right)+\csc^{2}\mathopen{}\left(x\right)\csc\mathopen{}\left(x\right)\)
2.4.48.
Answer.
\(0\)
2.5 The Chain Rule
Exercises
Terms and Concepts
2.5.1.
Answer.
\(\text{True}\)
2.5.2.
Answer.
\(\text{False}\)
2.5.3.
Answer.
\(\text{False}\)
2.5.4.
Answer.
\(\text{True}\)
2.5.5.
Answer.
\(\text{True}\)
2.5.6.
Answer.
\(\text{True}\)
Problems
2.5.7.
Answer.
\(10\mathopen{}\left(4x^{3}-x\right)^{9}\mathopen{}\left(12x^{2}-1\right)\)
2.5.8.
Answer.
\(15\mathopen{}\left(3t-2\right)^{4}\)
2.5.9.
Answer.
\(3\mathopen{}\left(\sin\mathopen{}\left(\theta\right)+\cos\mathopen{}\left(\theta\right)\right)^{2}\mathopen{}\left(\cos\mathopen{}\left(\theta\right)-\sin\mathopen{}\left(\theta\right)\right)\)
2.5.10.
Answer.
\(\left(6t+1\right)e^{3t^{2}+t-1}\)
2.5.11.
Answer.
\(4\mathopen{}\left(\ln\mathopen{}\left(x\right)-x^{4}\right)^{3}\mathopen{}\left(\frac{1}{x}-4x^{3}\right)\)
2.5.12.
Answer.
\(0.693147\cdot 2^{q^{5}+4q}\mathopen{}\left(5q^{4}+4\right)\)
2.5.13.
Answer.
\(5\mathopen{}\left(y+\frac{1}{y}\right)^{4}\mathopen{}\left(1-\frac{1}{y^{2}}\right)\)
2.5.14.
Answer.
\(-5\sin\mathopen{}\left(5t\right)\)
2.5.15.
Answer.
\(2\sec^{2}\mathopen{}\left(2q\right)\)
2.5.16.
Answer.
\(-\csc^{2}\mathopen{}\left(\theta^{2}+3\right)\cdot 2\theta\)
2.5.17.
Answer.
\(\left(6t^{5}-\frac{3t^{2}}{\left(t^{3}\right)^{2}}\right)\cos\mathopen{}\left(t^{6}+\frac{1}{t^{3}}\right)\)
2.5.18.
Answer.
\(-5\cos^{4}\mathopen{}\left(7q\right)\cdot 7\sin\mathopen{}\left(7q\right)\)
2.5.19.
Answer.
\(-3\cos^{2}\mathopen{}\left(y^{2}+3y-3\right)\mathopen{}\left(2y+3\right)\sin\mathopen{}\left(y^{2}+3y-3\right)\)
2.5.20.
Answer.
\(-\frac{1}{\cos\mathopen{}\left(t\right)}\sin\mathopen{}\left(t\right)\)
2.5.21.
Answer.
\(\frac{1}{q^{8}}\cdot 8q^{7}\)
2.5.22.
Answer.
\(3\frac{1}{y}\)
2.5.23.
Answer.
\(1.79176\cdot 6^{t}\)
2.5.24.
Answer.
\(-0.693147\cdot 2^{\csc\mathopen{}\left(z\right)}\csc\mathopen{}\left(z\right)\cot\mathopen{}\left(z\right)\)
2.5.25.
Answer.
\(0\)
2.5.26.
Answer.
\(\frac{1.38629\cdot 4^{t}\cdot 9^{t}-4^{t}\cdot 2.19722\cdot 9^{t}}{\left(9^{t}\right)^{2}}\)
2.5.27.
Answer.
\(\frac{1.79176\cdot 6^{w}\mathopen{}\left(5^{w}+6\right)-\left(6^{w}+5\right)\cdot 1.60944\cdot 5^{w}}{\left(5^{w}+6\right)^{2}}\)
2.5.28.
Answer.
\(\frac{1.94591\cdot 7^{y}\cdot 5^{y}-\left(7^{y}+8\right)\cdot 1.60944\cdot 5^{y}}{\left(5^{y}\right)^{2}}\)
2.5.29.
Answer.
\(\frac{\left(1.60944\cdot 5^{r^{2}}\cdot 2r-1\right)\cdot 6^{r^{2}}-\left(5^{r^{2}}-r\right)\cdot 1.79176\cdot 6^{r^{2}}\cdot 2r}{\left(6^{r^{2}}\right)^{2}}\)
2.5.30.
Answer.
\(3w^{2}\cot\mathopen{}\left(5w\right)-w^{3}\cdot 5\csc^{2}\mathopen{}\left(5w\right)\)
2.5.31.
Answer.
\(6\mathopen{}\left(x^{2}+4x\right)^{5}\mathopen{}\left(2x+4\right)\mathopen{}\left(7x^{4}+x\right)^{3}+\left(x^{2}+4x\right)^{6}\cdot 3\mathopen{}\left(7x^{4}+x\right)^{2}\mathopen{}\left(7\cdot 4x^{3}+1\right)\)
2.5.32.
Answer.
\(-\left(4\cos\mathopen{}\left(8-4r\right)\cos\mathopen{}\left(6r+r^{2}\right)+\left(6+2r\right)\sin\mathopen{}\left(6r+r^{2}\right)\sin\mathopen{}\left(8-4r\right)\right)\)
2.5.33.
Answer.
\(7\cos\mathopen{}\left(9+7w\right)\cos\mathopen{}\left(4w-5\right)-4\sin\mathopen{}\left(4w-5\right)\sin\mathopen{}\left(9+7w\right)\)
2.5.34.
Answer.
\(e^{8x^{2}}\cdot 8\cdot 2x\sin\mathopen{}\left(\frac{1}{x}\right)-e^{8x^{2}}\frac{1}{x^{2}}\cos\mathopen{}\left(\frac{1}{x}\right)\)
2.5.35.
Answer.
\(-\frac{6\sin\mathopen{}\left(6r+4\right)\mathopen{}\left(3r+1\right)^{3}+3\cdot 3\mathopen{}\left(3r+1\right)^{2}\cos\mathopen{}\left(6r+4\right)}{\left(\left(3r+1\right)^{3}\right)^{2}}\)
2.5.36.
Answer.
\(\frac{3\cdot 2\mathopen{}\left(3z+5\right)\sin\mathopen{}\left(9z\right)-\left(3z+5\right)^{2}\cdot 9\cos\mathopen{}\left(9z\right)}{\sin^{2}\mathopen{}\left(9z\right)}\)
2.5.37.
Answer 1.
\(y = 0\)
Answer 2.
\(x = 0\)
2.5.38.
Answer 1.
\(y = 15\mathopen{}\left(x-1\right)+1\)
Answer 2.
\(y = \frac{-1}{15}\mathopen{}\left(x-1\right)+1\)
2.5.39.
Answer 1.
\(y = -3\mathopen{}\left(x-\frac{\pi }{2}\right)+1\)
Answer 2.
\(y = \frac{1}{3}\mathopen{}\left(x-\frac{\pi }{2}\right)+1\)
2.5.40.
Answer 1.
\(y = -5e\mathopen{}\left(x+1\right)+e\)
Answer 2.
\(y = \frac{1}{5e}\mathopen{}\left(x+1\right)+e\)
2.5.41.
Answer.
\(\frac{1}{x}\)
2.5.42.
Answer.
\(\frac{k}{x}\)
2.6 Implicit Differentiation
2.6.4 Exercises
Terms and Concepts
2.6.4.2.
Answer.
\(\text{the chain rule}\)
2.6.4.3.
Answer.
\(\text{True}\)
2.6.4.4.
Answer.
\(\text{True}\)
Problems
2.6.4.5.
Answer.
\(\frac{1}{2\sqrt{w}}+\frac{\frac{1}{2\sqrt{w}}}{\left(\sqrt{w}\right)^{2}}\)
2.6.4.6.
Answer.
\({\frac{1}{6}}\frac{1}{\left(\sqrt[6]{y}\right)^{5}}+\left({\frac{5}{6}}\right)\frac{1}{y^{0.166667}}\)
2.6.4.7.
Answer.
\(\frac{1}{2\sqrt{9+t^{2}}}\cdot 2t\)
2.6.4.8.
Answer.
\(\frac{1}{2\sqrt{w}}\tan\mathopen{}\left(w\right)+\sec^{2}\mathopen{}\left(w\right)\sqrt{w}\)
2.6.4.9.
Answer.
\(1.2y^{0.2}\)
2.6.4.10.
Answer.
\(\pi r^{\pi -1}+3.8r^{2.8}\)
2.6.4.11.
Answer.
\(\frac{\sqrt{w}-\left(w-8\right)\frac{1}{2\sqrt{w}}}{\left(\sqrt{w}\right)^{2}}\)
2.6.4.12.
Answer.
\({\frac{1}{6}}\frac{1}{\left(\sqrt[6]{x}\right)^{5}}\mathopen{}\left(\cos\mathopen{}\left(x\right)+e^{x}\right)+\left(e^{x}-\sin\mathopen{}\left(x\right)\right)\sqrt[6]{x}\)
2.6.4.13.
Answer.
\(\frac{-4x^{3}}{2y+1}\)
2.6.4.14.
Answer.
\(\frac{-y^{0.6}}{x^{0.6}}\)
2.6.4.15.
Answer.
\(\sin\mathopen{}\left(x\right)\sec\mathopen{}\left(y\right)\)
2.6.4.16.
Answer.
\(\frac{y}{x}\)
2.6.4.17.
Answer.
\(\frac{y}{x}\)
2.6.4.18.
Answer.
\(\frac{-\left(e^{x}x\mathopen{}\left(x+2\right)\cdot 2^{-y}\right)}{\ln\mathopen{}\left(2\right)}\)
2.6.4.19.
Answer.
\(\frac{-2\sin\mathopen{}\left(y\right)\cos\mathopen{}\left(y\right)}{x}\)
2.6.4.20.
Answer.
\(-\frac{x}{y^{2}}\)
2.6.4.21.
Answer.
\(\frac{1}{2y+2}\)
2.6.4.22.
Answer.
\(\frac{y-x^{2}-2xy^{2}}{x-y^{2}-2x^{2}y}\)
2.6.4.23.
Answer.
\(\frac{1-\cos\mathopen{}\left(x\right)}{\sin\mathopen{}\left(y\right)+1}\)
2.6.4.24.
Answer.
\(\frac{-x}{y}\)
2.6.4.25.
Answer.
\(\frac{-\left(2x+y\right)}{2y+x}\)
2.6.4.27.
Answer.
\(y = 0\)
Answer.
\(y = -1.859\mathopen{}\left(x-0.1\right)+0.2811\)
2.6.4.28.
Answer.
\(x = 1\)
Answer.
\(y = \frac{-3\sqrt{3}}{8}\mathopen{}\left(x-\sqrt{0.6}\right)+\sqrt{0.8}\)
2.6.4.29.
Answer.
\(y = 4\)
Answer.
\(y = \frac{3}{108^{\frac{1}{4}}}\mathopen{}\left(x-2\right)-108^{\frac{1}{4}}\)
2.6.4.30.
Answer.
\(y = -x+1\)
Answer.
\(y = \frac{3\sqrt{3}}{4}\)
2.6.4.31.
Answer.
\(y = \frac{-1}{\sqrt{3}}\mathopen{}\left(x-\frac{7}{2}\right)+\frac{6+3\sqrt{3}}{2}\)
Answer.
\(y = \frac{\sqrt{3}\mathopen{}\left(x-\left(4+3\sqrt{3}\right)\right)}{2}+\frac{3}{2}\)
2.6.4.32.
Answer.
\(y = 1\)
Answer.
\(y = \frac{-2}{\sqrt{5}}\mathopen{}\left(x+1\right)+\frac{1}{2}\mathopen{}\left(-1+\sqrt{5}\right)\)
Answer.
\(y = \frac{2}{\sqrt{5}}\mathopen{}\left(x+1\right)+\frac{1}{2}\mathopen{}\left(-1-\sqrt{5}\right)\)
2.6.4.33.
Answer.
\(\frac{-\left(\left(2y+1\right)\cdot 12x^{2}-4x^{3}\frac{2\mathopen{}\left(-\left(4x^{3}\right)\right)}{2y+1}\right)}{\left(2y+1\right)^{2}}\)
2.6.4.34.
Answer.
\(\frac{-\left(\frac{x^{0.6}\cdot 3}{5}y^{-0.4}\frac{-y^{0.6}}{x^{0.6}}-\frac{y^{0.6}\cdot 3}{5}x^{-0.4}\right)}{x^{1.2}}\)
2.6.4.35.
Answer.
\(\sin^{2}\mathopen{}\left(x\right)\sec^{2}\mathopen{}\left(y\right)\tan\mathopen{}\left(y\right)+\cos\mathopen{}\left(x\right)\sec\mathopen{}\left(y\right)\)
2.6.4.36.
Answer.
\(0\)
2.6.4.37.
Answer 1.
\(\left(1+x\right)^{\frac{1}{x}}\mathopen{}\left(\frac{1}{x\mathopen{}\left(x+1\right)}-\frac{\ln\mathopen{}\left(1+x\right)}{x^{2}}\right)\)
Answer 2.
\(y = \left(1-2\ln\mathopen{}\left(2\right)\right)\mathopen{}\left(x-1\right)+2\)
2.6.4.38.
Answer 1.
\(\left(2x\right)^{x^{2}}\mathopen{}\left(2x\ln\mathopen{}\left(2x\right)+x\right)\)
Answer 2.
\(y = \left(2+4\ln\mathopen{}\left(2\right)\right)\mathopen{}\left(x-1\right)+2\)
2.6.4.39.
Answer 1.
\(\frac{x^{x}}{x+1}\mathopen{}\left(\ln\mathopen{}\left(x\right)+1-\frac{1}{x+1}\right)\)
Answer 2.
\(y = \frac{1}{4}\mathopen{}\left(x-1\right)+\frac{1}{2}\)
2.6.4.40.
Answer 1.
\(x^{\sin\mathopen{}\left(x\right)+2}\mathopen{}\left(\cos\mathopen{}\left(x\right)\ln\mathopen{}\left(x\right)+\frac{\sin\mathopen{}\left(x\right)+2}{x}\right)\)
Answer 2.
\(y = \frac{3\pi ^{2}}{4}\mathopen{}\left(x-\frac{\pi }{2}\right)+\left(\frac{\pi }{2}\right)^{3}\)
2.6.4.41.
Answer 1.
\(\frac{x+1}{x+2}\mathopen{}\left(\frac{1}{x+1}-\frac{1}{x+2}\right)\)
Answer 2.
\(y = \frac{1}{9}\mathopen{}\left(x-1\right)+\frac{2}{3}\)
2.6.4.42.
Answer 1.
\(\frac{\left(x+1\right)\mathopen{}\left(x+2\right)}{\left(x+3\right)\mathopen{}\left(x+4\right)}\mathopen{}\left(\frac{1}{x+1}+\frac{1}{x+2}-\frac{1}{x+3}-\frac{1}{x+4}\right)\)
Answer 2.
\(y = \frac{11}{72}x+\frac{1}{6}\)
2.7 Derivatives of Inverse Functions
Exercises
Terms and Concepts
2.7.1.
Answer.
\(\text{False}\)
Problems
2.7.9.
Answer.
\({\frac{1}{7}}\)
2.7.10.
Answer.
\(-{\frac{1}{22}}\)
2.7.11.
Answer.
\(-0.5\)
2.7.12.
Answer.
\({\frac{1}{132}}\)
2.7.13.
Answer.
\(-{\frac{25}{4}}\)
2.7.14.
Answer.
\({\frac{1}{12}}\)
2.7.15.
Answer.
\(-\frac{1}{\sqrt{1-\left(4w\right)^{2}}}\cdot 4\)
2.7.16.
Answer.
\(-\frac{1}{\left|7x\right|\sqrt{\left(7x\right)^{2}-1}}\cdot 7\)
2.7.17.
Answer.
\(\frac{1}{1+\left(2r\right)^{2}}\cdot 2\)
2.7.18.
Answer.
\(\cos^{-1}\mathopen{}\left(w\right)-w\frac{1}{\sqrt{1-w^{2}}}\)
2.7.19.
Answer.
\(\left(\sec\mathopen{}\left(x\right)\right)^{2}\cos^{-1}\mathopen{}\left(x\right)-\frac{1}{\sqrt{1-x^{2}}}\tan\mathopen{}\left(x\right)\)
2.7.20.
Answer.
\(\frac{e^{t}}{t}+\ln\mathopen{}\left(t\right)e^{t}\)
2.7.21.
Answer.
\(\frac{\frac{1}{1+z^{2}}\sin^{-1}\mathopen{}\left(z\right)-\frac{1}{\sqrt{1-z^{2}}}\tan^{-1}\mathopen{}\left(z\right)}{\left(\sin^{-1}\mathopen{}\left(z\right)\right)^{2}}\)
2.7.22.
Answer.
\(\left(\sec\mathopen{}\left(\sqrt[4]{x}\right)\right)^{2}{\frac{1}{4}}\frac{1}{\left(\sqrt[4]{x}\right)^{3}}\)
2.7.23.
Answer.
\(\csc\mathopen{}\left(\frac{1}{q^{3}}\right)\cot\mathopen{}\left(\frac{1}{q^{3}}\right)\frac{3q^{2}}{\left(q^{3}\right)^{2}}\)
2.7.24.
Answer.
\(1\)
2.7.29.
Answer.
\(y = 2\mathopen{}\left(x-\frac{-\sqrt{3}}{2}\right)+\left(-\frac{\pi }{3}\right)\)
2.7.30.
Answer.
\(y = -4\mathopen{}\left(x-\frac{\sqrt{3}}{4}\right)+\frac{\pi }{6}\)
3 The Graphical Behavior of Functions
3.1 Extreme Values
Exercises
Terms and Concepts
3.1.2.
Answer.
Answers will vary.
3.1.4.
Answer.
Answers will vary.
3.1.5.
Answer.
\(\text{False}\)
3.1.6.
Answer 1.
\(0\)
Answer 2.
\(\text{undefined}\)
Problems
3.1.7.
Answer 1.
\(\text{B}\)
Answer 2.
\(\text{NONE}\)
Answer 3.
\(\text{B}, \text{G}\)
Answer 4.
\(\text{C}, \text{F}\)
3.1.8.
Answer 1.
\(\text{C}\)
Answer 2.
\(\text{A}\)
Answer 3.
\(\text{C}\)
Answer 4.
\(\text{A}, \text{E}\)
3.1.9.
Answer.
\(0\)
3.1.10.
Answer 1.
\(0\)
Answer 2.
\(0\)
3.1.11.
Answer 1.
\(0\)
Answer 2.
\(0\)
3.1.12.
Answer 1.
\(0\)
Answer 2.
\(0\)
Answer 3.
\(\text{DNE}\)
3.1.13.
Answer 1.
\(\text{DNE}\)
Answer 2.
\(0\)
3.1.14.
Answer 1.
\(\text{DNE}\)
Answer 2.
\(\text{DNE}\)
3.1.15.
Answer.
\(0\)
3.1.16.
Answer.
\(\text{DNE}\)
3.1.17.
Answer 1.
\(14\)
Answer 2.
\(-2\)
3.1.18.
Answer 1.
\(-6\)
Answer 2.
\(-28\)
3.1.19.
Answer 1.
\(-2.82843\)
Answer 2.
\(-4\)
3.1.20.
Answer 1.
\(30.4664\)
Answer 2.
\(0\)
3.1.21.
Answer 1.
\({\frac{9}{2}}\)
Answer 2.
\(2.82843\)
3.1.22.
Answer 1.
\({\frac{4}{11}}\)
Answer 2.
\(0\)
3.1.23.
Answer 1.
\(\frac{e^{\frac{\pi }{4}}}{\sqrt{2}}\)
Answer 2.
\(-e^{\pi }\)
3.1.24.
Answer 1.
\(\frac{e^{\frac{3\pi }{4}}}{\sqrt{2}}\)
Answer 2.
\(0\)
3.1.25.
Answer 1.
\(\frac{1}{2e}\)
Answer 2.
\(0\)
3.1.26.
Answer 1.
\(0.47247\)
Answer 2.
\(-6.31821\)
3.2 The Mean Value Theorem
Exercises
Problems
3.2.3.
Answer.
\(\left(-1,1\right)\)
3.2.4.
Answer.
\(\text{does not apply}\)
3.2.5.
Answer.
\(-{\frac{1}{2}}\)
3.2.6.
Answer.
\(-{\frac{1}{2}}\)
3.2.7.
Answer.
\(\text{does not apply}\)
3.2.8.
Answer.
\(\frac{\pi }{2}\)
3.2.9.
Answer.
\(\text{does not apply}\)
3.2.10.
Answer.
\(\text{does not apply}\)
3.2.11.
Answer.
\(0\)
3.2.12.
Answer.
\({\frac{5}{2}}\)
3.2.13.
Answer.
\(3\frac{\sqrt{2}}{2}\)
3.2.14.
Answer.
\({\frac{19}{4}}\)
3.2.15.
Answer.
\(\text{does not apply}\)
3.2.16.
Answer.
\(\frac{4}{\ln\mathopen{}\left(5\right)}\)
3.2.17.
Answer.
\(-\sec^{-1}\mathopen{}\left(\frac{2}{\sqrt{\pi }}\right), \sec^{-1}\mathopen{}\left(\frac{2}{\sqrt{\pi }}\right)\)
3.2.18.
Answer.
\(-{\frac{2}{3}}\)
3.2.19.
Answer.
\(5+7\frac{\sqrt{7}}{6}, 5-7\frac{\sqrt{7}}{6}\)
3.2.20.
Answer.
\(\frac{\sqrt{\pi ^{2}-4}}{\pi }, \frac{-\sqrt{\pi ^{2}-4}}{\pi }\)
3.3 Increasing and Decreasing Functions
Exercises
Terms and Concepts
3.3.3.
Answer.
Answers will vary; graphs should be steeper near \(x=0\) than near \(x=2\text{.}\)
3.3.5.
Answer.
\(\text{False}\)
Problems
3.3.15.
Answer 1.
\(\left(-\infty ,\infty \right)\)
Answer 2.
\(-2\)
Answer 3.
\(\left[-2,\infty \right)\)
Answer 4.
\(\left(-\infty ,-2\right]\)
Answer 5.
\(\text{NONE}\)
Answer 6.
\(-2\)
3.3.16.
Answer 1.
\(\left(-\infty ,\infty \right)\)
Answer 2.
\(-{\frac{4}{3}}, 0\)
Answer 3.
\(\left(-\infty ,-1.33333\right], \left[0,\infty \right)\)
Answer 4.
\(\left[-1.33333,0\right]\)
Answer 5.
\(-1.33333\)
Answer 6.
\(0\)
3.3.17.
Answer 1.
\(\left(-\infty ,\infty \right)\)
Answer 2.
\(-{\frac{5}{7}}, {\frac{7}{3}}\)
Answer 3.
\(\left(-\infty ,-0.714286\right], \left[2.33333,\infty \right)\)
Answer 4.
\(\left[-0.714286,2.33333\right]\)
Answer 5.
\(-{\frac{5}{7}}\)
Answer 6.
\({\frac{7}{3}}\)
3.3.18.
Answer 1.
\(\left(-\infty ,\infty \right)\)
Answer 2.
\(3\)
Answer 3.
\(\left(-\infty ,\infty \right)\)
Answer 4.
\(\text{NONE}\)
Answer 5.
\(\text{NONE}\)
Answer 6.
\(\text{NONE}\)
3.3.19.
Answer 1.
\(\left(-\infty ,\infty \right)\)
Answer 2.
\(5\)
Answer 3.
\(\left(-\infty ,5\right]\)
Answer 4.
\(\left[5,\infty \right)\)
Answer 5.
\(5\)
Answer 6.
\(\text{NONE}\)
3.3.20.
Answer 1.
\(\left(-\infty ,-6\right)\cup \left(-6,6\right)\cup \left(6,\infty \right)\)
Answer 2.
\(0\)
Answer 3.
\(\left(-\infty ,-6\right), \left(-6,0\right]\)
Answer 4.
\(\left[0,6\right), \left(6,\infty \right)\)
Answer 5.
\(0\)
Answer 6.
\(\text{NONE}\)
3.3.21.
Answer 1.
\(\left(-\infty ,-7\right)\cup \left(-7,-5\right)\cup \left(-5,\infty \right)\)
Answer 2.
\(-5.91608, 5.91608\)
Answer 3.
\(\left[-5.91608,-5\right), \left(-5,5.91608\right]\)
Answer 4.
\(\left(-\infty ,-7\right), \left(-7,-5.91608\right], \left[5.91608,\infty \right)\)
Answer 5.
\(5.91608\)
Answer 6.
\(-5.91608\)
3.3.22.
Answer 1.
\(\left(-\infty ,0\right)\cup \left(0,\infty \right)\)
Answer 2.
\(-5, -15\)
Answer 3.
\(\left[-15,-5\right]\)
Answer 4.
\(\left(-\infty ,-15\right], \left[-5,0\right), \left(0,\infty \right)\)
Answer 5.
\(-5\)
Answer 6.
\(-15\)
3.3.23.
Answer 1.
\(\left(-\pi ,\pi \right)\)
Answer 2.
\(-2.35619, -0.785398, 0.785398, 2.35619\)
Answer 3.
\(\left(-3.14159,-2.35619\right), \left(-0.785398,0.785398\right), \left(2.35619,3.14159\right)\)
Answer 4.
\(\left(-2.35619,-0.785398\right), \left(0.785398,2.35619\right)\)
Answer 5.
\(-2.35619, 0.785398\)
Answer 6.
\(-0.785398, 2.35619\)
3.3.24.
Answer 1.
\(\left(-\infty ,\infty \right)\)
Answer 2.
\(-2\)
Answer 3.
\(\left[-2,\infty \right)\)
Answer 4.
\(\left(-\infty ,-2\right]\)
Answer 5.
\(\text{NONE}\)
Answer 6.
\(-2\)
3.4 Concavity and the Second Derivative
3.4.3 Exercises
Terms and Concepts
3.4.3.1.
Answer.
Answers will vary.
3.4.3.2.
Answer.
Answers will vary.
3.4.3.3.
Answer.
Yes; Answers will vary.
3.4.3.4.
Answer.
No.
Problems
3.4.3.15.
Answer 1.
\(\text{NONE}\)
Answer 2.
\(\left(-\infty ,\infty \right)\)
Answer 3.
\(\text{NONE}\)
3.4.3.16.
Answer 1.
\(\text{NONE}\)
Answer 2.
\(\text{NONE}\)
Answer 3.
\(\left(-\infty ,\infty \right)\)
3.4.3.17.
Answer 1.
\(0\)
Answer 2.
\(\left[0,\infty \right)\)
Answer 3.
\(\left(-\infty ,0\right]\)
3.4.3.18.
Answer 1.
\(-{\frac{1}{4}}\)
Answer 2.
\(\left[-0.25,\infty \right)\)
Answer 3.
\(\left(-\infty ,-0.25\right]\)
3.4.3.19.
Answer 1.
\(-{\frac{32}{3}}, 0\)
Answer 2.
\(\left(-\infty ,-10.6667\right], \left[0,\infty \right)\)
Answer 3.
\(\left[-10.6667,0\right]\)
3.4.3.20.
Answer 1.
\(4.42265, 5.57735\)
Answer 2.
\(\left(-\infty ,4.42265\right], \left[5.57735,\infty \right)\)
Answer 3.
\(\left[4.42265,5.57735\right]\)
3.4.3.21.
Answer 1.
\(-2\)
Answer 2.
\(\left(-\infty ,\infty \right)\)
Answer 3.
\(\text{NONE}\)
3.4.3.22.
Answer 1.
\(\text{NONE}\)
Answer 2.
\(\left(-1.5708,1.5708\right)\)
Answer 3.
\(\left(-4.71239,-1.5708\right), \left(1.5708,4.71239\right)\)
3.4.3.23.
Answer 1.
\(-0.57735, 0.57735\)
Answer 2.
\(\left(-\infty ,-0.57735\right], \left[0.57735,\infty \right)\)
Answer 3.
\(\left[-0.57735,0.57735\right]\)
3.4.3.24.
Answer 1.
\(\text{NONE}\)
Answer 2.
\(\left(-\infty ,2\right), \left(5,\infty \right)\)
Answer 3.
\(\left(2,5\right)\)
3.4.3.25.
Answer 1.
\(-0.785398, 2.35619\)
Answer 2.
\(\left(-3.14159,-0.785398\right], \left[2.35619,3.14159\right)\)
Answer 3.
\(\left[-0.785398,2.35619\right]\)
3.4.3.26.
Answer 1.
\(-0.585786, -3.41421\)
Answer 2.
\(\left(-\infty ,-3.41421\right], \left[-0.585786,\infty \right)\)
Answer 3.
\(\left[-3.41421,-0.585786\right]\)
3.4.3.27.
Answer 1.
\(0.22313\)
Answer 2.
\(\left[0.22313,\infty \right)\)
Answer 3.
\(\left(0,0.22313\right]\)
3.4.3.28.
Answer 1.
\(0.707107, -0.707107\)
Answer 2.
\(\left(-\infty ,-0.707107\right], \left[0.707107,\infty \right)\)
Answer 3.
\(\left[-0.707107,0.707107\right]\)
3.4.3.29.
Answer 1.
\(-7\)
Answer 2.
\(\text{NONE}\)
Answer 3.
\(-7\)
3.4.3.30.
Answer 1.
\(-{\frac{5}{2}}\)
Answer 2.
\(-{\frac{5}{2}}\)
Answer 3.
\(\text{NONE}\)
3.4.3.31.
Answer 1.
\(-1.1547, 1.1547\)
Answer 2.
\(-1.1547\)
Answer 3.
\(1.1547\)
3.4.3.32.
Answer 1.
\(\text{NONE}\)
Answer 2.
\(\text{NONE}\)
Answer 3.
\(\text{NONE}\)
3.4.3.33.
Answer 1.
\(-4\)
Answer 2.
\(\text{NONE}\)
Answer 3.
\(-4\)
3.4.3.34.
Answer 1.
\(-3, -2, 2\)
Answer 2.
\(-2\)
Answer 3.
\(-3, 2\)
3.4.3.35.
Answer 1.
\(3\)
Answer 2.
\(\text{NONE}\)
Answer 3.
\(\text{NONE}\)
3.4.3.36.
Answer 1.
\(-3.14159, 0, 3.14159\)
Answer 2.
\(-3.14159, 3.14159\)
Answer 3.
\(0\)
3.4.3.37.
Answer 1.
\(-9\)
Answer 2.
\(-9\)
Answer 3.
\(\text{NONE}\)
3.4.3.38.
Answer 1.
\(0\)
Answer 2.
\(0\)
Answer 3.
\(\text{NONE}\)
3.4.3.39.
Answer 1.
\(-2.35619, 0.785398\)
Answer 2.
\(0.785398\)
Answer 3.
\(-2.35619\)
3.4.3.40.
Answer 1.
\(-2, 0\)
Answer 2.
\(-2\)
Answer 3.
\(0\)
3.4.3.41.
Answer 1.
\(0.606531\)
Answer 2.
\(\text{NONE}\)
Answer 3.
\(0.606531\)
3.4.3.42.
Answer 1.
\(0\)
Answer 2.
\(0\)
Answer 3.
\(\text{NONE}\)
3.4.3.43.
Answer 1.
\(\text{NONE}\)
Answer 2.
\(\text{NONE}\)
3.4.3.44.
Answer 1.
\(\text{NONE}\)
Answer 2.
\(\text{NONE}\)
3.4.3.45.
Answer 1.
\(\text{NONE}\)
Answer 2.
\(0\)
3.4.3.46.
Answer 1.
\(-{\frac{8}{27}}\)
Answer 2.
\(\text{NONE}\)
3.4.3.47.
Answer 1.
\(-{\frac{28}{3}}\)
Answer 2.
\(0\)
3.4.3.48.
Answer 1.
\(1.42265\)
Answer 2.
\(2.57735\)
3.4.3.49.
Answer 1.
\(\text{NONE}\)
Answer 2.
\(\text{NONE}\)
3.4.3.50.
Answer 1.
\(\text{NONE}\)
Answer 2.
\(\text{NONE}\)
3.4.3.51.
Answer 1.
\(0\)
Answer 2.
\(2\)
3.4.3.52.
Answer 1.
\(\text{NONE}\)
Answer 2.
\(\text{NONE}\)
3.4.3.53.
Answer 1.
\(-0.785398\)
Answer 2.
\(2.35619\)
3.4.3.54.
Answer 1.
\(-3.41421\)
Answer 2.
\(-0.585786\)
3.4.3.55.
Answer 1.
\(\text{NONE}\)
Answer 2.
\(0.22313\)
3.4.3.56.
Answer 1.
\(-0.707107\)
Answer 2.
\(0.707107\)
3.5 Curve Sketching
Exercises
Terms and Concepts
3.5.3.
Answer.
\(\text{True}\)
3.5.4.
Answer.
\(\text{True}\)
3.5.5.
Answer.
\(\text{True}\)
4 Applications of the Derivative
4.1 Newton’s Method
Exercises
Terms and Concepts
4.1.1.
Answer.
\(\text{False}\)
4.1.2.
Answer.
\(\text{False}\)
Problems
4.1.3.
Answer 1.
\(1.57091\)
Answer 2.
\(1.5708\)
Answer 3.
\(1.5708\)
Answer 4.
\(1.5708\)
Answer 5.
\(1.5708\)
4.1.4.
Answer 1.
\(-0.557408\)
Answer 2.
\(0.0659365\)
Answer 3.
\(-9.57219\times 10^{-5}\)
Answer 4.
\(0\)
Answer 5.
\(0\)
4.1.5.
Answer 1.
\(2\)
Answer 2.
\(1.2\)
Answer 3.
\(1.01176\)
Answer 4.
\(1.00005\)
Answer 5.
\(1\)
4.1.6.
Answer 1.
\(1.41667\)
Answer 2.
\(1.41422\)
Answer 3.
\(1.41421\)
Answer 4.
\(1.41421\)
Answer 5.
\(1.41421\)
4.1.7.
Answer 1.
\(0.613706\)
Answer 2.
\(0.913341\)
Answer 3.
\(0.996132\)
Answer 4.
\(0.999993\)
Answer 5.
\(1\)
4.1.8.
Answer 1.
\(1.44444\)
Answer 2.
\(1.13057\)
Answer 3.
\(1.01498\)
Answer 4.
\(1.00022\)
Answer 5.
\(1\)
4.1.9.
Answer.
\(\left\{-5.15633,-0.369102,0.525428\right\}\)
4.1.10.
Answer.
\(\left\{-3.71448,-0.856723,1,1.5712\right\}\)
4.1.11.
Answer.
\(\left\{-1.0134,0.988312,1.39341\right\}\)
4.1.12.
Answer.
\(\left\{-2.16477,0,0.524501,1.81328\right\}\)
4.1.13.
Answer.
\(\left\{-0.824132,0.824132\right\}\)
4.1.14.
Answer.
\(\left\{-0.636733,1.40962\right\}\)
4.1.15.
Answer.
\(\left\{0\right\}\)
4.1.16.
Answer.
\(\left\{-4.49341,0,4.49341\right\}\)
4.2 Related Rates
Exercises
Terms and Concepts
4.2.1.
Answer.
\(\text{True}\)
4.2.2.
Answer.
\(\text{False}\)
Problems
4.2.3.
Answer.
\(0.198944\ {\textstyle\frac{\rm\mathstrut cm}{\rm\mathstrut s}}\)
Answer.
\(0.0198944\ {\textstyle\frac{\rm\mathstrut cm}{\rm\mathstrut s}}\)
Answer.
\(0.00198944\ {\textstyle\frac{\rm\mathstrut cm}{\rm\mathstrut s}}\)
4.2.4.
Answer.
\(0.397887\ {\textstyle\frac{\rm\mathstrut cm}{\rm\mathstrut s}}\)
Answer.
\(0.00397887\ {\textstyle\frac{\rm\mathstrut cm}{\rm\mathstrut s}}\)
Answer.
\(3.97887\times 10^{-5}\ {\textstyle\frac{\rm\mathstrut cm}{\rm\mathstrut s}}\)
4.2.5.
Answer.
\(51.066\ {\textstyle\frac{\rm\mathstrut mi}{\rm\mathstrut h}}\)
4.2.6.
Answer.
\(68.75\ {\textstyle\frac{\rm\mathstrut mi}{\rm\mathstrut h}}\)
Answer.
\(75\ {\textstyle\frac{\rm\mathstrut mi}{\rm\mathstrut h}}\)
4.2.7.
Answer.
\(258.537\ {\textstyle\frac{\rm\mathstrut rad}{\rm\mathstrut hr}}\)
Answer.
\(413.417\ {\textstyle\frac{\rm\mathstrut rad}{\rm\mathstrut hr}}\)
Answer.
\(424\ {\textstyle\frac{\rm\mathstrut rad}{\rm\mathstrut hr}}\)
4.2.8.
Answer.
\(0.0225641\ {\textstyle\frac{\rm\mathstrut rad}{\rm\mathstrut s}}\)
Answer.
\(0.553459\ {\textstyle\frac{\rm\mathstrut rad}{\rm\mathstrut s}}\)
Answer.
\(7.33333\ {\textstyle\frac{\rm\mathstrut rad}{\rm\mathstrut s}}\)
4.2.9.
Answer.
\(0.0417029\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
Answer.
\(0.458349\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
Answer.
\(3.35489\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
Answer.
\(\infty \)
4.2.10.
Answer.
\(30.5941\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut min}}\)
Answer.
\(36.0555\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut min}}\)
Answer.
\(301.496\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut min}}\)
4.2.11.
Answer.
\(19.1658\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
Answer.
\(0.191658\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
Answer.
\(0.0395988\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
Answer.
\(381.791\ {\rm s}\)
4.2.12.
Answer.
\(0.632456\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
Answer.
\(1.6\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
Answer.
\(51.9615\ {\rm ft}\)
4.2.13.
Answer.
\(80\ {\rm ft}\)
Answer.
\(1.71499\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
Answer.
\(1.83829\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
Answer.
\(74.162\ {\rm ft}\)
4.2.14.
Answer.
\(96\ {\rm ft}\)
Answer.
\(9.42478\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
4.2.15.
Answer.
\(0.00230973\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
4.3 Optimization
Exercises
Terms and Concepts
4.3.1.
Answer.
\(\text{True}\)
4.3.2.
Answer.
\(\text{False}\)
Problems
4.3.3.
Answer.
\(5625\)
4.3.4.
Answer.
\(2\sqrt{560}\)
4.3.5.
Answer.
\(\text{DNE}\)
4.3.6.
Answer.
\({\frac{8450}{29}}\)
4.3.7.
Answer.
\(1\)
4.3.8.
Answer.
\(150\ {\rm ft};\,\left({\frac{225}{2}}\right)\ {\rm ft}\)
4.3.9.
Answer 1.
\(3.83722\ {\rm cm}\)
Answer 2.
\(7.67443\ {\rm cm}\)
4.3.10.
Answer 1.
\(3.20058\ {\rm in}\)
Answer 2.
\(6.40117\ {\rm in}\)
4.3.11.
Answer 1.
\(3.0456\ {\rm cm}\)
Answer 2.
\(12.1824\ {\rm cm}\)
4.3.12.
Answer.
\(11664\ {\rm in^{3}}\)
4.3.13.
Answer.
\(10.3923\ {\rm in};\,14.6969\ {\rm in}\)
4.3.14.
Answer 1.
\(0.535898\ {\rm mi}\)
Answer 2.
\(\$503{,}730.67\)
4.3.15.
Answer 1.
\(0\ {\rm mi}\)
Answer 2.
\(\$474{,}341.65\)
4.3.16.
Answer.
\(33.6239\ {\rm ft}\)
4.3.17.
Answer.
\(23.7599\ {\rm ft}\)
4.3.18.
Answer.
\(\sqrt{2};\,\sqrt{2}\)
4.4 Differentials
Exercises
Terms and Concepts
4.4.1.
Answer.
\(\text{True}\)
4.4.2.
Answer.
\(\text{True}\)
4.4.3.
Answer.
\(\text{False}\)
4.4.4.
Answer.
\(\text{True}\)
4.4.6.
Answer.
\(\text{True}\)
Problems
4.4.7.
Answer.
\(4.28\)
4.4.8.
Answer.
\(8.7\)
4.4.9.
Answer.
\(83.2\)
4.4.10.
Answer.
\(102.5\)
4.4.11.
Answer.
\(5.05\)
4.4.12.
Answer.
\(5.88333\)
4.4.13.
Answer.
\(4.98667\)
4.4.14.
Answer.
\(6.00556\)
4.4.15.
Answer.
\(0.141593\)
4.4.16.
Answer.
\(1.1\)
4.4.17.
Answer.
\(\left(2x-5\right)dx\)
4.4.18.
Answer.
\(\left(5x^{4}+9x^{8}\right)dx\)
4.4.19.
Answer.
\(-\frac{24x^{5}}{\left(4x^{6}\right)^{2}}dx\)
4.4.20.
Answer.
\(2\mathopen{}\left(6x+\sin\mathopen{}\left(x\right)\right)\mathopen{}\left(6+\cos\mathopen{}\left(x\right)\right)dx\)
4.4.21.
Answer.
\(\left(7x^{6}+8e^{8x}\right)dx\)
4.4.22.
Answer.
\(-\frac{40x^{4}}{\left(x^{5}\right)^{2}}dx\)
4.4.23.
Answer.
\(\frac{9\mathopen{}\left(\tan\mathopen{}\left(x\right)+2\right)-9x\sec^{2}\mathopen{}\left(x\right)}{\left(\tan\mathopen{}\left(x\right)+2\right)^{2}}dx\)
4.4.24.
Answer.
\(\frac{9}{9x}dx\)
4.4.25.
Answer.
\(\left(e^{x}\sin\mathopen{}\left(x\right)+e^{x}\cos\mathopen{}\left(x\right)\right)dx\)
4.4.26.
Answer.
\(-\sin\mathopen{}\left(\sin\mathopen{}\left(x\right)\right)\cos\mathopen{}\left(x\right)dx\)
4.4.27.
Answer.
\(\frac{x+5-\left(x-4\right)}{\left(x+5\right)^{2}}dx\)
4.4.28.
Answer.
\(\left(1.60944\cdot 5^{x}\ln\mathopen{}\left(x\right)+\frac{5^{x}\cdot 1}{x}\right)dx\)
4.4.29.
Answer.
\(\tan^{-1}\mathopen{}\left(x\right)dx\)
4.4.30.
Answer.
\(\cot\mathopen{}\left(x\right)dx\)
4.4.31.
Answer.
\(5.02655\ {\rm cm^{3}}\)
4.4.32.
Answer.
\(51.2\)
Answer.
\(76.8\)
4.4.33.
Answer.
\(3.92699\)
4.4.34.
Answer.
\(-4\ {\rm ft^{2}}\)
4.4.35.
Answer.
\(297.717\ {\rm ft}\)
Answer.
\(62.3155\ {\rm ft}\)
Answer.
\(20.9\%\)
4.4.36.
Answer.
\(298.868\ {\rm ft}\)
Answer.
\(17.335\ {\rm ft}\)
Answer.
\(5.8\%\)
4.4.37.
Answer.
\(298.868\ {\rm ft}\)
Answer.
\(8.66751\ {\rm ft}\)
Answer.
\(2.9\%\)
4.4.38.
Answer.
\(\text{Isosceles triangle at 50 feet}\)
4.4.39.
Answer.
\(1\%\)
4.5 Taylor Polynomials
Exercises
Terms and Concepts
4.5.2.
Answer.
\(\text{True}\)
4.5.3.
Answer.
\(6+3x-4x^{2}\)
4.5.4.
Answer.
\(30\)
Problems
4.5.5.
Answer.
\(1-x+0.5x^{2}-0.166667x^{3}\)
4.5.6.
Answer.
\(x-0.166667x^{3}+0.00833333x^{5}-0.000198413x^{7}\)
4.5.7.
Answer.
\(x+x^{2}+0.5x^{3}+0.166667x^{4}+0.0416667x^{5}\)
4.5.8.
Answer.
\(x+0.333333x^{3}+0.133333x^{5}\)
4.5.9.
Answer.
\(1+2x+2x^{2}+1.33333x^{3}+0.666667x^{4}\)
4.5.10.
Answer.
\(1+x+x^{2}+x^{3}+x^{4}\)
4.5.11.
Answer.
\(1-x+x^{2}-x^{3}+x^{4}\)
4.5.12.
Answer.
\(1-x+x^{2}-x^{3}+x^{4}-x^{5}+x^{6}-x^{7}\)
4.5.13.
Answer.
\(1+0.5\mathopen{}\left(x-1\right)-0.125\mathopen{}\left(x-1\right)^{2}+0.0625\mathopen{}\left(x-1\right)^{3}-0.0390625\mathopen{}\left(x-1\right)^{4}\)
4.5.14.
Answer.
\(0.693147+0.5\mathopen{}\left(x-1\right)-0.125\mathopen{}\left(x-1\right)^{2}+0.0416667\mathopen{}\left(x-1\right)^{3}-0.015625\mathopen{}\left(x-1\right)^{4}\)
4.5.15.
Answer.
\(0.707107-0.707107\mathopen{}\left(x-\frac{\pi }{4}\right)-0.353553\mathopen{}\left(x-\frac{\pi }{4}\right)^{2}+0.117851\mathopen{}\left(x-\frac{\pi }{4}\right)^{3}+0.0294628\mathopen{}\left(x-\frac{\pi }{4}\right)^{4}-0.00589256\mathopen{}\left(x-\frac{\pi }{4}\right)^{5}-0.000982093\mathopen{}\left(x-\frac{\pi }{4}\right)^{6}\)
4.5.16.
Answer.
\(0.5+0.866025\mathopen{}\left(x-\frac{\pi }{6}\right)-0.25\mathopen{}\left(x-\frac{\pi }{6}\right)^{2}-0.144338\mathopen{}\left(x-\frac{\pi }{6}\right)^{3}+0.0208333\mathopen{}\left(x-\frac{\pi }{6}\right)^{4}+0.00721688\mathopen{}\left(x-\frac{\pi }{6}\right)^{5}\)
4.5.17.
Answer.
\(0.5-0.25\mathopen{}\left(x-2\right)+0.125\mathopen{}\left(x-2\right)^{2}-0.0625\mathopen{}\left(x-2\right)^{3}+0.03125\mathopen{}\left(x-2\right)^{4}+0.015625\mathopen{}\left(x-2\right)^{5}\)
4.5.18.
Answer.
\(1-2\mathopen{}\left(x-1\right)+3\mathopen{}\left(x-1\right)^{2}-4\mathopen{}\left(x-1\right)^{3}+5\mathopen{}\left(x-1\right)^{4}-6\mathopen{}\left(x-1\right)^{5}+7\mathopen{}\left(x-1\right)^{6}-8\mathopen{}\left(x-1\right)^{7}+9\mathopen{}\left(x-1\right)^{8}\)
4.5.19.
Answer.
\(0.5+0.5\mathopen{}\left(x+1\right)+0.25\mathopen{}\left(x+1\right)^{2}\)
4.5.20.
Answer.
\(-\pi ^{2}-2\pi \mathopen{}\left(x-\pi \right)+\frac{\pi ^{2}-2}{2}\mathopen{}\left(x-\pi \right)^{2}\)
4.5.31.
Answer.
The \(n\)th term is: when \(n\) even, 0; when \(n\) is odd, \(\frac{(-1)^{(n-1)/2}}{n!}x^n\text{.}\)
5 Integration
5.1 Antiderivatives and Indefinite Integration
Exercises
Terms and Concepts
5.1.2.
Answer.
\(\text{an antiderivative}\)
5.1.4.
Answer 1.
\(\text{opposite}\)
Answer 2.
\(\text{opposite}\)
5.1.6.
Answer.
\(\text{velocity}\)
5.1.7.
Answer.
\(\text{velocity}\)
5.1.8.
Answer.
\(F\mathopen{}\left(x\right)+G\mathopen{}\left(x\right)\)
Problems
5.1.9.
Answer.
\(\left({\frac{4}{3}}\right)x^{6}+C\)
5.1.10.
Answer.
\({\frac{1}{10}}x^{10}+C\)
5.1.11.
Answer.
\(\left({\frac{5}{9}}\right)x^{9}-6x+C\)
5.1.12.
Answer.
\(t+C\)
5.1.13.
Answer.
\(s+C\)
5.1.14.
Answer.
\(C-\frac{1}{35t^{7}}\)
5.1.15.
Answer.
\(C-\frac{2}{t^{3}}\)
5.1.16.
Answer.
\(2\sqrt{x}+C\)
5.1.17.
Answer.
\(\sec\mathopen{}\left(\theta\right)+C\)
5.1.18.
Answer.
\(-\cos\mathopen{}\left(\theta\right)+C\)
5.1.19.
Answer.
\(\sec\mathopen{}\left(x\right)+\csc\mathopen{}\left(x\right)+C\)
5.1.20.
Answer.
\(2e^{\theta}+C\)
5.1.21.
Answer.
\(\frac{3^{t}}{\ln\mathopen{}\left(3\right)}+C\)
5.1.22.
Answer.
\(\frac{4^{t}}{9\ln\mathopen{}\left(4\right)}+C\)
5.1.23.
Answer.
\(\left({\frac{25}{3}}\right)t^{3}+10t^{2}+4t+\left({\frac{8}{15}}\right)+C\)
5.1.24.
Answer.
\(\frac{t^{10}}{10}-\frac{t^{6}}{2}-5t^{2}+C\)
5.1.25.
Answer.
\(\frac{x^{17}}{17}+C\)
5.1.26.
Answer.
\(1.41421^{e}x+C\)
5.1.27.
Answer.
\(rx+C\)
5.1.30.
Answer.
\(8-\cos\mathopen{}\left(x\right)\)
5.1.31.
Answer.
\(2e^{x}+6\)
5.1.32.
Answer.
\(3\frac{x^{4}}{4}-3x^{2}+9\)
5.1.33.
Answer.
\(\sec\mathopen{}\left(x\right)+4\)
5.1.34.
Answer.
\(\frac{5^{x}}{\ln\mathopen{}\left(5\right)}-\frac{25}{\ln\mathopen{}\left(5\right)}+5\)
5.1.35.
Answer.
\(3x^{2}+2x+5\)
5.1.36.
Answer.
\(\left({\frac{2}{3}}\right)x^{3}+7x+\left(-{\frac{5}{3}}\right)\)
5.1.37.
Answer.
\(7e^{x}-10x-15\)
5.1.38.
Answer.
\(6\theta-\cos\mathopen{}\left(\theta\right)+10\)
5.1.39.
Answer.
\(x^{6}+\frac{2^{x}}{0.480453}-\cos\mathopen{}\left(x\right)-1.4427x+0.918631\)
5.1.40.
Answer.
\(-\left(2x+11\right)\)
5.2 The Definite Integral
Exercises
Terms and Concepts
5.2.3.
Answer.
\(0\)
5.2.4.
Answer.
\(\int 0^2 (2x+3)\, dx\)
Problems
5.2.5.
Answer.
\(3\)
Answer.
\(4\)
Answer.
\(3\)
Answer.
\(0\)
Answer.
\(-4\)
Answer.
\(9\)
5.2.6.
Answer.
\(-4\)
Answer.
\(-5\)
Answer.
\(-3\)
Answer.
\(1\)
Answer.
\(-2\)
Answer.
\(10\)
5.2.7.
Answer.
\(4\)
Answer.
\(2\)
Answer.
\(4\)
Answer.
\(2\)
Answer.
\(1\)
Answer.
\(2\)
5.2.8.
Answer.
\(-{\frac{1}{2}}\)
Answer.
\(0\)
Answer.
\({\frac{3}{2}}\)
Answer.
\({\frac{3}{2}}\)
Answer.
\({\frac{9}{2}}\)
Answer.
\({\frac{15}{2}}\)
5.2.9.
Answer.
\(\pi \)
Answer.
\(\pi \)
Answer.
\(2\pi \)
Answer.
\(10\pi \)
5.2.10.
Answer.
\(15\)
Answer.
\(12\)
Answer.
\(0\)
Answer.
\(3\mathopen{}\left(b-a\right)\)
5.2.11.
Answer.
\(-59\)
Answer.
\(-48\)
Answer.
\(-27\)
Answer.
\(-33\)
5.2.12.
Answer.
\(\frac{4}{\pi }\)
Answer.
\(\frac{-4}{\pi }\)
Answer.
\(0\)
Answer.
\(\frac{2}{\pi }\)
5.2.13.
Answer.
\(4\)
Answer.
\(4\)
Answer.
\(-4\)
Answer.
\(-2\)
5.2.14.
Answer.
\({\frac{40}{3}}\)
Answer.
\({\frac{26}{3}}\)
Answer.
\({\frac{8}{3}}\)
Answer.
\({\frac{38}{3}}\)
5.2.15.
Answer.
\(2\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
Answer.
\(2\ {\rm ft}\)
Answer.
\(1.5\ {\rm ft}\)
5.2.16.
Answer.
\(3\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
Answer.
\(9.5\ {\rm ft}\)
Answer.
\(9.5\ {\rm ft}\)
5.2.17.
Answer.
\(64\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
Answer.
\(64\ {\rm ft}\)
Answer.
\(2\ {\rm s}\)
Answer.
\(4.64575\ {\rm s}\)
5.2.18.
Answer.
\(96\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
Answer.
\(6\ {\rm s}\)
Answer.
\(6\ {\rm s}\)
Answer.
\(208\ {\rm ft}\)
5.2.19.
Answer.
\(2\)
5.2.20.
Answer.
\(5\)
5.2.21.
Answer.
\(16\)
5.2.22.
Answer.
\(a = -{\frac{2}{7}}b\)
5.2.23.
Answer.
\(22\)
5.2.24.
Answer.
\(-7\)
5.2.25.
Answer.
\(0\)
5.2.26.
Answer.
\(a = -{\frac{18}{11}}b\)
5.3 Riemann Sums
5.3.4 Exercises
Terms and Concepts
5.3.4.1.
Answer.
\(\text{limits}\)
5.3.4.2.
Answer.
\(12\)
5.3.4.3.
Answer.
\(\text{rectangles}\)
5.3.4.4.
Answer.
\(\text{True}\)
Problems
5.3.4.5.
Answer 1.
\(9+16+25+36\)
Answer 2.
\(86\)
5.3.4.6.
Answer 1.
\(-4+\left(-1\right)+2+5+8\)
Answer 2.
\(10\)
5.3.4.7.
Answer 1.
\(0+\left(-1\right)+0+1\)
Answer 2.
\(0\)
5.3.4.8.
Answer 1.
\(9+9+9+9+9+9+9+9\)
Answer 2.
\(72\)
5.3.4.9.
Answer 1.
\(1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{1}{6}\)
Answer 2.
\({\frac{49}{20}}\)
5.3.4.10.
Answer 1.
\(-1+2+\left(-3\right)+4+\left(-5\right)+6+\left(-7\right)+8\)
Answer 2.
\(4\)
5.3.4.11.
Answer 1.
\(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}\)
Answer 2.
\({\frac{3}{4}}\)
5.3.4.12.
Answer 1.
\(1+1+1+1+1+1\)
Answer 2.
\(6\)
5.3.4.13.
Answer.
\(1;\,4;\,3i\)
5.3.4.14.
Answer.
\(0;\,6;\,i^{2}+2\)
5.3.4.15.
Answer.
\(1;\,5;\,\frac{i}{i+3}\)
5.3.4.16.
Answer.
\(1;\,5;\,-\left(-e\right)^{i}\)
5.3.4.17.
Answer.
\(72\)
5.3.4.18.
Answer.
\(435\)
5.3.4.19.
Answer.
\(1456\)
5.3.4.20.
Answer.
\(30336\)
5.3.4.21.
Answer.
\(-3220\)
5.3.4.22.
Answer.
\(-687\)
5.3.4.23.
Answer.
\(4560\)
5.3.4.24.
Answer.
\(4324\)
5.3.4.25.
Answer.
\(135\)
5.3.4.26.
Answer.
\(146340\)
5.3.4.27.
Answer.
\(21\)
5.3.4.28.
Answer.
\(106272\)
5.3.4.35.
Answer 1.
\(\frac{\left(n-1\right)^{2}}{4n^{2}}\)
Answer 2.
\(0.2025\)
Answer 3.
\(0.245025\)
Answer 4.
\(0.2495\)
Answer 5.
\({\frac{1}{4}}\)
5.3.4.36.
Answer 1.
\(6+\frac{9}{1n}+\frac{9}{1n^{2}}\)
Answer 2.
\(6.99\)
Answer 3.
\(6.0909\)
Answer 4.
\(6.00901\)
Answer 5.
\(6\)
5.3.4.37.
Answer 1.
\(36\)
Answer 2.
\(36\)
Answer 3.
\(36\)
Answer 4.
\(36\)
Answer 5.
\(36\)
5.3.4.38.
Answer 1.
\(\left({\frac{212}{3}}\right)+\frac{-48}{1n}+\frac{16}{3n^{2}}\)
Answer 2.
\(65.92\)
Answer 3.
\(70.1872\)
Answer 4.
\(70.6187\)
Answer 5.
\({\frac{212}{3}}\)
5.3.4.39.
Answer 1.
\(132-\frac{242}{n}\)
Answer 2.
\(107.8\)
Answer 3.
\(129.58\)
Answer 4.
\(131.758\)
Answer 5.
\(132\)
5.3.4.40.
Answer 1.
\(-{\frac{1}{12}}+\frac{1}{12n^{2}}\)
Answer 2.
\(-0.0825\)
Answer 3.
\(-0.083325\)
Answer 4.
\(-0.0833332\)
Answer 5.
\(-{\frac{1}{12}}\)
5.4 The Fundamental Theorem of Calculus
5.4.6 Exercises
Terms and Concepts
5.4.6.2.
Answer.
\(0\)
5.4.6.3.
Answer.
\(\text{True}\)
Problems
5.4.6.5.
Answer.
\(4\)
5.4.6.6.
Answer.
\({\frac{65}{3}}\)
5.4.6.7.
Answer.
\(0\)
5.4.6.8.
Answer.
\(1\)
5.4.6.9.
Answer.
\(2-\sqrt{2}\)
5.4.6.10.
Answer.
\(7\)
5.4.6.11.
Answer.
\(\frac{\left({\frac{32767}{512}}\right)}{\ln\mathopen{}\left(8\right)}\)
5.4.6.12.
Answer.
\(-2\)
5.4.6.13.
Answer.
\(-4\)
5.4.6.14.
Answer.
\(e^{2}-e^{1}\)
5.4.6.15.
Answer.
\(42\)
5.4.6.16.
Answer.
\(2\)
5.4.6.17.
Answer.
\({\frac{4096}{5}}\)
5.4.6.18.
Answer.
\(\ln\mathopen{}\left(6\right)\)
5.4.6.19.
Answer.
\({\frac{6}{7}}\)
5.4.6.20.
Answer.
\({\frac{59048}{295245}}\)
5.4.6.21.
Answer.
\({\frac{1}{2}}\)
5.4.6.22.
Answer.
\({\frac{1}{3}}\)
5.4.6.23.
Answer.
\({\frac{1}{4}}\)
5.4.6.24.
Answer.
\({\frac{1}{91}}\)
5.4.6.25.
Answer.
\(14\)
5.4.6.26.
Answer.
\(24\)
5.4.6.27.
Answer.
\(0\)
5.4.6.28.
Answer.
\(2-\sqrt{2}\)
5.4.6.31.
Answer.
\(1.1547\)
5.4.6.32.
Answer.
\(-4.6188, 4.6188\)
5.4.6.33.
Answer.
\(0.541325\)
5.4.6.34.
Answer.
\(4\)
5.4.6.35.
Answer.
\(\frac{\frac{1}{\pi -\frac{\pi }{2}}\cdot 3.14159}{\pi }\)
5.4.6.36.
Answer.
\(\frac{\frac{0}{\pi -0}\cdot 3.14159}{\pi }\)
5.4.6.37.
Answer.
\({\frac{7}{2}}\)
5.4.6.38.
Answer.
\({\frac{64}{3}}\)
5.4.6.39.
Answer.
\({\frac{729}{4}}\)
5.4.6.40.
Answer.
\(\frac{1}{e^{1}-1}\)
5.4.6.41.
Answer.
\(-168\ {\rm ft}\)
5.4.6.42.
Answer.
\(144\ {\rm ft}\)
5.4.6.43.
Answer.
\(76\ {\rm ft}\)
5.4.6.44.
Answer.
\(11.4965\ {\rm mi}\)
5.4.6.45.
Answer.
\(0\ {\rm ft}\)
5.4.6.46.
Answer.
\({\frac{10240}{3}}\ {\rm ft}\)
5.4.6.47.
Answer.
\(-256\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
5.4.6.48.
Answer.
\(72\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
5.4.6.49.
Answer.
\({\frac{1}{2}}\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
5.4.6.50.
Answer.
\(1\ {\textstyle\frac{\rm\mathstrut ft}{\rm\mathstrut s}}\)
5.4.6.55.
Answer.
\(\frac{3x^{2}-7}{x^{3}-7x}\)
5.4.6.56.
Answer.
\(-3x^{11}\)
5.4.6.57.
Answer.
\(3x^{2}\mathopen{}\left(x^{3}-1\right)-\left(x-1\right)\)
5.4.6.58.
Answer.
\(e^{x}\cos\mathopen{}\left(e^{x}\right)-\cos\mathopen{}\left(x\right)\cos\mathopen{}\left(\sin\mathopen{}\left(x\right)\right)\)
5.4.6.59.
Answer.
\(4x^{3}\sin\mathopen{}\left(4x^{8}\right)\)
5.4.6.60.
Answer.
\(\frac{1}{x}\sqrt{\ln^{4}\mathopen{}\left(x\right)+6\ln^{2}\mathopen{}\left(x\right)}-\cos\mathopen{}\left(x\right)\sqrt{\sin^{4}\mathopen{}\left(x\right)+6\sin^{2}\mathopen{}\left(x\right)}\)
5.5 Numerical Integration
5.5.6 Exercises
Terms and Concepts
5.5.6.1.
Answer.
\(\text{False}\)
5.5.6.4.
Answer.
A quadratic function (i.e., parabola)
Problems
5.5.6.5.
Answer.
\(0.75\)
Answer.
\(0.666667\)
Answer.
\(0.666667\)
5.5.6.6.
Answer.
\(250\)
Answer.
\(250\)
Answer.
\(250\)
5.5.6.7.
Answer.
\(1.89612\)
Answer.
\(2.00456\)
Answer.
\(2\)
5.5.6.8.
Answer.
\(5.14626\)
Answer.
\(5.25221\)
Answer.
\(5.33333\)
5.5.6.9.
Answer.
\(38.5781\)
Answer.
\(36.75\)
Answer.
\(36.75\)
5.5.6.10.
Answer.
\(0.220703\)
Answer.
\(0.200521\)
Answer.
\(0.2\)
5.5.6.11.
Answer.
\(0\)
Answer.
\(0\)
Answer.
\(0\)
5.5.6.12.
Answer.
\(12.2942\)
Answer.
\(13.3923\)
Answer.
\(14.1372\)
5.5.6.13.
Answer.
\(0.900628\)
Answer.
\(0.904523\)
5.5.6.14.
Answer.
\(3.02419\)
Answer.
\(2.93151\)
5.5.6.15.
Answer.
\(13.9604\)
Answer.
\(13.9066\)
5.5.6.16.
Answer.
\(3.06949\)
Answer.
\(3.14295\)
5.5.6.17.
Answer.
\(1.17029\)
Answer.
\(1.18728\)
5.5.6.18.
Answer.
\(2.52971\)
Answer.
\(2.54465\)
5.5.6.19.
Answer.
\(1.08025\)
Answer.
\(1.07699\)
5.5.6.20.
Answer.
\(3.46822\)
Answer.
\(3.4985\)
5.5.6.21.
Answer.
\(161\)
Answer.
\(12\)
5.5.6.22.
Answer.
\(130\)
Answer.
\(18\)
5.5.6.23.
Answer.
\(994\)
Answer.
\(62\)
5.5.6.24.
Answer.
\(5591\)
Answer.
\(46\)
5.5.6.25.
Answer 1.
\(30.8667\ {\rm cm^{2}}\)
Answer 2.
\(308667\ {\rm ft^{2}}\)
5.5.6.26.
Answer 1.
\(25.0667\ {\rm cm^{2}}\)
Answer 2.
\(250667\ {\rm ft^{2}}\)
II Math 2560: Calculus II
6 Techniques of Antidifferentiation
6.1 Substitution
6.1.5 Exercises
Terms and Concepts
6.1.5.1.
Answer.
\(\text{the Chain Rule}\)
6.1.5.2.
Answer.
\(\text{True}\)
Problems
6.1.5.3.
Answer.
\({\frac{1}{6}}\mathopen{}\left(x^{4}+3\right)^{6}+C\)
6.1.5.4.
Answer.
\({\frac{1}{7}}\mathopen{}\left(x^{2}-9x-3\right)^{7}+C\)
6.1.5.5.
Answer.
\({\frac{1}{20}}\mathopen{}\left(x^{2}-7\right)^{10}+C\)
6.1.5.6.
Answer.
\(\left({\frac{2}{9}}\right)\mathopen{}\left(3x-5x^{2}-4\right)^{9}+C\)
6.1.5.7.
Answer.
\({\frac{1}{4}}\ln\mathopen{}\left(\left|4x+5\right|\right)+C\)
6.1.5.8.
Answer.
\(\left({\frac{2}{5}}\right)\sqrt{5x+9}+C\)
6.1.5.9.
Answer.
\({\frac{2}{3}}\mathopen{}\left(x-2\right)\sqrt{x+1}+C\)
6.1.5.10.
Answer.
\(x^{\left({\frac{3}{2}}\right)}\mathopen{}\left({\frac{2}{7}}x^{2}+2\right)+C\)
6.1.5.11.
Answer.
\(2e^{\sqrt{x}}+C\)
6.1.5.12.
Answer.
\(\left({\frac{1}{3}}\right)\sqrt{x^{6}+8}+C\)
6.1.5.13.
Answer.
\(C-{\frac{1}{2}}\mathopen{}\left(\frac{1}{x}-9\right)^{2}\)
6.1.5.14.
Answer.
\(\frac{\ln^{2}\mathopen{}\left(x\right)}{2}+C\)
6.1.5.15.
Answer.
\(\frac{\left(\sin\mathopen{}\left(x\right)\right)^{4}}{4}+C\)
6.1.5.16.
Answer.
\(C-\frac{\left(\cos\mathopen{}\left(x\right)\right)^{5}}{5}\)
6.1.5.17.
Answer.
\(C-\frac{\sin\mathopen{}\left(8-5x\right)}{5}\)
6.1.5.18.
Answer.
\(C-\frac{\tan\mathopen{}\left(5-4x\right)}{4}\)
6.1.5.19.
Answer.
\({\frac{1}{7}}\ln\mathopen{}\left(\left|\sec\mathopen{}\left(7x\right)+\tan\mathopen{}\left(7x\right)\right|\right)+C\)
6.1.5.20.
Answer.
\({\frac{1}{9}}\mathopen{}\left(\tan\mathopen{}\left(x\right)\right)^{9}+C\)
6.1.5.21.
Answer.
\(C-{\frac{1}{9}}\cos\mathopen{}\left(x^{9}\right)\)
6.1.5.22.
Answer.
\(\tan\mathopen{}\left(x\right)-x+C\)
6.1.5.23.
Answer.
\(\ln\mathopen{}\left(\left|\sin\mathopen{}\left(x\right)\right|\right)+C\)
6.1.5.24.
Answer.
\(-\ln\mathopen{}\left(\left|\csc\mathopen{}\left(x\right)+\cot\mathopen{}\left(x\right)\right|\right)+C\)
6.1.5.25.
Answer.
\({\frac{1}{4}}e^{4x-9}+C\)
6.1.5.26.
Answer.
\({\frac{1}{5}}e^{x^{5}}+C\)
6.1.5.27.
Answer.
\({\frac{1}{2}}e^{\left(x+1\right)^{2}}+C\)
6.1.5.28.
Answer.
\(x-3e^{-x}+C\)
6.1.5.29.
Answer.
\(\ln\mathopen{}\left(e^{x}+8\right)+C\)
6.1.5.30.
Answer.
\(C-\left({\frac{1}{2}}e^{-2x}+{\frac{1}{4}}e^{-4x}\right)\)
6.1.5.31.
Answer.
\(\frac{2^{2x}}{1.38629}+C\)
6.1.5.32.
Answer.
\(\frac{2^{7x}}{4.85203}+C\)
6.1.5.33.
Answer.
\(\frac{\ln^{2}\mathopen{}\left(x\right)}{2}+C\)
6.1.5.34.
Answer.
\(\frac{\left(\ln\mathopen{}\left(x\right)\right)^{5}}{5}+C\)
6.1.5.35.
Answer.
\(\left({\frac{5}{2}}\right)\mathopen{}\left(\ln\mathopen{}\left(x\right)\right)^{2}+C\)
6.1.5.36.
Answer.
\({\frac{1}{6}}\ln\mathopen{}\left(\left|\ln\mathopen{}\left(x^{6}\right)\right|\right)+C\)
6.1.5.37.
Answer.
\(\frac{x^{2}}{2}+4x+7\ln\mathopen{}\left(\left|x\right|\right)+C\)
6.1.5.38.
Answer.
\(\frac{x^{3}}{3}+\frac{x^{2}}{2}+x+\ln\mathopen{}\left(\left|x\right|\right)+C\)
6.1.5.39.
Answer.
\({\frac{1}{3}}\mathopen{}\left(x+1\right)^{3}+\left({\frac{3}{2}}\right)\mathopen{}\left(x+1\right)^{2}+3\mathopen{}\left(x+1\right)-5\ln\mathopen{}\left(\left|x+1\right|\right)+C\)
6.1.5.40.
Answer.
\(\frac{\left(x-3\right)^{2}}{2}+10\mathopen{}\left(x-3\right)+12\ln\mathopen{}\left(\left|x-3\right|\right)+C\)
6.1.5.41.
Answer.
\(C-\left(\left({\frac{7}{2}}\right)\mathopen{}\left(x-6\right)^{2}+85\mathopen{}\left(x-6\right)+250\ln\mathopen{}\left(\left|x-6\right|\right)\right)\)
6.1.5.42.
Answer.
\({\frac{1}{3}}\ln\mathopen{}\left(\left|x^{3}-6x^{2}-9x\right|\right)+C\)
6.1.5.43.
Answer.
\(2.44949\tan^{-1}\mathopen{}\left(\frac{x}{2.44949}\right)+C\)
6.1.5.44.
Answer.
\(5\sin^{-1}\mathopen{}\left(\frac{x}{5}\right)+C\)
6.1.5.45.
Answer.
\(3\sin^{-1}\mathopen{}\left(\frac{x}{3.16228}\right)+C\)
6.1.5.46.
Answer.
\(\left({\frac{8}{7}}\right)\sec^{-1}\mathopen{}\left(\frac{\left|x\right|}{7}\right)+C\)
6.1.5.47.
Answer.
\(\left({\frac{1}{2}}\right)\sec^{-1}\mathopen{}\left(\frac{\left|x\right|}{8}\right)+C\)
6.1.5.48.
Answer.
\(0.5\sin^{-1}\mathopen{}\left(x^{2}\right)+C\)
6.1.5.49.
Answer.
\(0.301511\tan^{-1}\mathopen{}\left(\frac{x+9}{11}\right)+C\)
6.1.5.50.
Answer.
\(7\sin^{-1}\mathopen{}\left(\frac{x-7}{4}\right)+C\)
6.1.5.51.
Answer.
\(2\sin^{-1}\mathopen{}\left(\frac{x-5}{9}\right)+C\)
6.1.5.52.
Answer.
\(\tan^{-1}\mathopen{}\left(\frac{x-3}{7}\right)+C\)
6.1.5.53.
Answer.
\(C-\frac{1}{6\mathopen{}\left(x^{6}-4\right)}\)
6.1.5.54.
Answer.
\({\frac{1}{7}}\mathopen{}\left(5x^{5}+9x^{4}-4\right)^{7}+C\)
6.1.5.55.
Answer.
\(\left({\frac{1}{2}}\right)\sqrt{6+2x^{2}}+C\)
6.1.5.56.
Answer.
\(\tan\mathopen{}\left(x^{8}-5\right)+C\)
6.1.5.57.
Answer.
\(C-{\frac{2}{3}}\mathopen{}\left(\cos\mathopen{}\left(x\right)\right)^{\left({\frac{3}{2}}\right)}\)
6.1.5.58.
Answer.
\({\frac{1}{9}}\sin\mathopen{}\left(9x+1\right)+C\)
6.1.5.59.
Answer.
\(\ln\mathopen{}\left(\left|x-7\right|\right)+C\)
6.1.5.60.
Answer.
\(\left({\frac{1}{4}}\right)\ln\mathopen{}\left(\left|8x+7\right|\right)+C\)
6.1.5.61.
Answer.
\(x^{2}+2x+\ln\mathopen{}\left(\left|x^{2}-4x+1\right|\right)+C\)
6.1.5.62.
Answer.
\(\ln\mathopen{}\left(\left|x^{2}-2x-7\right|\right)+C\)
6.1.5.63.
Answer.
\(2\ln\mathopen{}\left(\left|x^{2}+6x-9\right|\right)+C\)
6.1.5.64.
Answer.
\(-\left({\frac{1}{2}}\right)x^{2}-x+\ln\mathopen{}\left(\left|x^{2}+3x-1\right|\right)+C\)
6.1.5.65.
Answer.
\({\frac{1}{16}}\tan^{-1}\mathopen{}\left(\frac{x^{2}}{8}\right)+C\)
6.1.5.66.
Answer.
\(\tan^{-1}\mathopen{}\left(9x\right)+C\)
6.1.5.67.
Answer.
\(\sec^{-1}\mathopen{}\left(\left|9x\right|\right)+C\)
6.1.5.68.
Answer.
\({\frac{1}{3}}\sin^{-1}\mathopen{}\left(3\frac{x}{2}\right)+C\)
6.1.5.69.
Answer.
\(\left({\frac{5}{2}}\right)\ln\mathopen{}\left(\left|x^{2}-10x+74\right|\right)+\left({\frac{1}{7}}\right)\tan^{-1}\mathopen{}\left(\frac{x-5}{7}\right)+C\)
6.1.5.70.
Answer.
\(\left({\frac{19}{5}}\right)\tan^{-1}\mathopen{}\left(\frac{x-3}{5}\right)+\ln\mathopen{}\left(\left|x^{2}-6x+34\right|\right)+C\)
6.1.5.71.
Answer.
\(x+14.1421\tan^{-1}\mathopen{}\left(\frac{x-1}{1.41421}\right)+\left({\frac{17}{2}}\right)\ln\mathopen{}\left(\left|x^{2}-2x+3\right|\right)+C\)
6.1.5.72.
Answer.
\(\frac{x^{2}}{2}-18\ln\mathopen{}\left(\left|x^{2}+36\right|\right)+C\)
6.1.5.73.
Answer.
\({\frac{1}{2}}x^{2}-6x+\left({\frac{7}{2}}\right)\ln\mathopen{}\left(\left|x^{2}+6x+15\right|\right)+4.49073\tan^{-1}\mathopen{}\left(\frac{x+3}{2.44949}\right)+C\)
6.1.5.74.
Answer.
\(-\tan^{-1}\mathopen{}\left(\cos\mathopen{}\left(x\right)\right)+C\)
6.1.5.75.
Answer.
\(\tan^{-1}\mathopen{}\left(\sin\mathopen{}\left(x\right)\right)+C\)
6.1.5.76.
Answer.
\(C-\ln\mathopen{}\left(\left|\csc\mathopen{}\left(x\right)+\cot\mathopen{}\left(x\right)\right|\right)\)
6.1.5.77.
Answer.
\(9\sqrt{x^{2}+16x+63}+C\)
6.1.5.78.
Answer.
\(\sqrt{x^{2}+12x+32}+C\)
6.1.5.79.
Answer.
\(\ln\mathopen{}\left(\left({\frac{3}{7}}\right)\right)\)
6.1.5.80.
Answer.
\({\frac{361568}{15}}\)
6.1.5.81.
Answer.
\(0\)
6.1.5.82.
Answer.
\({\frac{1}{8}}\)
6.1.5.83.
Answer.
\({\frac{1}{2}}\mathopen{}\left(e^{4}-e\right)\)
6.1.5.84.
Answer.
\(\frac{\pi }{2}\)
6.1.5.85.
Answer.
\(\frac{\pi }{2}\)
6.1.5.86.
Answer.
\(\left({\frac{5}{6}}\right)\pi \)
6.2 Integration by Parts
Exercises
Terms and Concepts
6.2.1.
Answer.
\(\text{True}\)
6.2.2.
Answer.
\(\text{False}\)
6.2.4.
Answer.
\(\text{False}\)
Problems
6.2.5.
Answer.
\(\sin\mathopen{}\left(x\right)-x\cos\mathopen{}\left(x\right)+C\)
6.2.6.
Answer.
\(-e^{-x}\mathopen{}\left(x+1\right)+C\)
6.2.7.
Answer.
\(-x^{2}\cos\mathopen{}\left(x\right)+2x\sin\mathopen{}\left(x\right)+2\cos\mathopen{}\left(x\right)+C\)
6.2.8.
Answer.
\(-x^{3}\cos\mathopen{}\left(x\right)+3x^{2}\sin\mathopen{}\left(x\right)+6x\cos\mathopen{}\left(x\right)-6\sin\mathopen{}\left(x\right)+C\)
6.2.9.
Answer.
\({\frac{1}{2}}e^{x^{2}}+C\)
6.2.10.
Answer.
\(e^{x}\mathopen{}\left(x^{3}-3x^{2}+6x-6\right)+C\)
6.2.11.
Answer.
\(-{\frac{1}{2}}xe^{-2x}-\frac{e^{-2x}}{4}+C\)
6.2.12.
Answer.
\({\frac{1}{2}}e^{x}\mathopen{}\left(\sin\mathopen{}\left(x\right)-\cos\mathopen{}\left(x\right)\right)+C\)
6.2.13.
Answer.
\({\frac{1}{5}}e^{2x}\mathopen{}\left(\sin\mathopen{}\left(x\right)+2\cos\mathopen{}\left(x\right)\right)+C\)
6.2.14.
Answer.
\(\left({\frac{1}{130}}\right)e^{7x}\mathopen{}\left(7\sin\mathopen{}\left(9x\right)-9\cos\mathopen{}\left(9x\right)\right)+C\)
6.2.15.
Answer.
\(\left({\frac{1}{16}}\right)e^{8x}\mathopen{}\left(\sin\mathopen{}\left(8x\right)+\cos\mathopen{}\left(8x\right)\right)+C\)
6.2.16.
Answer.
\(0.5\sin^{2}\mathopen{}\left(x\right)+C\)
6.2.17.
Answer.
\(\sqrt{1-x^{2}}+x\sin^{-1}\mathopen{}\left(x\right)+C\)
6.2.18.
Answer.
\(x\tan^{-1}\mathopen{}\left(2x\right)-0.25\ln\mathopen{}\left(4x^{2}+1\right)+C\)
6.2.19.
Answer.
\(0.5x^{2}\tan^{-1}\mathopen{}\left(x\right)-\frac{x}{2}+0.5\tan^{-1}\mathopen{}\left(x\right)+C\)
6.2.20.
Answer.
\(-\sqrt{1-x^{2}}+x\cos^{-1}\mathopen{}\left(x\right)+C\)
6.2.21.
Answer.
\(0.5x^{2}\ln\mathopen{}\left(x\right)-\frac{x^{2}}{4}+C\)
6.2.22.
Answer.
\({\frac{1}{2}}x^{2}\ln\mathopen{}\left(x\right)-\frac{x^{2}}{4}+x\ln\mathopen{}\left(x\right)-x+C\)
6.2.23.
Answer.
\({\frac{1}{2}}x^{2}\ln\mathopen{}\left(x-3\right)-{\frac{1}{4}}\mathopen{}\left(x-3\right)^{2}-3x-\left({\frac{9}{2}}\right)\ln\mathopen{}\left(x-3\right)+C\)
6.2.24.
Answer.
\(0.5x^{2}\ln\mathopen{}\left(x^{2}\right)-\frac{x^{2}}{2}+C\)
6.2.25.
Answer.
\(0.333333x^{3}\ln\mathopen{}\left(x\right)-\frac{x^{3}}{9}+C\)
6.2.26.
Answer.
\(2x+x\ln^{2}\mathopen{}\left(x\right)-2x\ln\mathopen{}\left(x\right)+C\)
6.2.27.
Answer.
\(2\mathopen{}\left(x-8\right)+\left(x-8\right)\mathopen{}\left(\ln\mathopen{}\left(x-8\right)\right)^{2}-2\mathopen{}\left(x-8\right)\ln\mathopen{}\left(x-8\right)+C\)
6.2.28.
Answer.
\(x\tan\mathopen{}\left(x\right)+\ln\mathopen{}\left(\left|\cos\mathopen{}\left(x\right)\right|\right)+C\)
6.2.29.
Answer.
\(\ln\mathopen{}\left(\left|\sin\mathopen{}\left(x\right)\right|\right)-x\cot\mathopen{}\left(x\right)+C\)
6.2.30.
Answer.
\(\left({\frac{2}{5}}\mathopen{}\left(x-2\right)^{2}+\left({\frac{4}{3}}\right)\mathopen{}\left(x-2\right)\right)\sqrt{x-2}+C\)
6.2.31.
Answer.
\({\frac{1}{3}}\mathopen{}\left(x^{2}-6\right)^{\left({\frac{3}{2}}\right)}+C\)
6.2.32.
Answer.
\(\sec\mathopen{}\left(x\right)+C\)
6.2.33.
Answer.
\(x\sec\mathopen{}\left(x\right)-\ln\mathopen{}\left(\left|\sec\mathopen{}\left(x\right)+\tan\mathopen{}\left(x\right)\right|\right)+C\)
6.2.34.
Answer.
\(-x\csc\mathopen{}\left(x\right)-\ln\mathopen{}\left(\left|\csc\mathopen{}\left(x\right)+\cot\mathopen{}\left(x\right)\right|\right)+C\)
6.2.35.
Answer.
\(\frac{x}{2}\mathopen{}\left(\sin\mathopen{}\left(\ln\mathopen{}\left(x\right)\right)+\cos\mathopen{}\left(\ln\mathopen{}\left(x\right)\right)\right)+C\)
6.2.36.
Answer.
\(\sin\mathopen{}\left(e^{x}\right)-e^{x}\cos\mathopen{}\left(e^{x}\right)+C\)
6.2.37.
Answer.
\(2\sin\mathopen{}\left(\sqrt{x}\right)-2\sqrt{x}\cos\mathopen{}\left(\sqrt{x}\right)+C\)
6.2.38.
Answer.
\(x\ln\mathopen{}\left(\sqrt{x}\right)-\frac{x}{2}+C\)
6.2.39.
Answer.
\(2\sqrt{x}e^{\sqrt{x}}-2e^{\sqrt{x}}+C\)
6.2.40.
Answer.
\(\frac{x^{2}}{2}+C\)
6.2.41.
Answer.
\(-1\)
6.2.42.
Answer.
\(-\left(2\frac{1}{e}+e^{2}\right)\)
6.2.43.
Answer.
\(0\)
6.2.44.
Answer.
\(\frac{3\pi ^{2}}{2}-12\)
6.2.45.
Answer.
\({\frac{1}{2}}\)
6.2.46.
Answer.
\(0.563436\)
6.2.47.
Answer.
\(\left(-{\frac{7}{4}}\right)e^{-6}-\left(-{\frac{5}{4}}\right)e^{-4}\)
6.2.48.
Answer.
\(0.5e^{\pi }+0.5\)
6.2.49.
Answer.
\(0.2\mathopen{}\left(-e^{3\pi }-e^{-3\pi }\right)\)
6.3 Trigonometric Integrals
6.3.4 Exercises
Terms and Concepts
6.3.4.1.
Answer.
\(\text{False}\)
6.3.4.2.
Answer.
\(\text{False}\)
6.3.4.3.
Answer.
\(\text{False}\)
6.3.4.4.
Answer.
\(\text{False}\)
Problems
6.3.4.5.
Answer.
\(-0.2\cos^{5}\mathopen{}\left(x\right)+C\)
6.3.4.6.
Answer.
\(0.25\sin^{4}\mathopen{}\left(x\right)+C\)
6.3.4.7.
Answer.
\({\frac{1}{7}}\mathopen{}\left(\cos\mathopen{}\left(x\right)\right)^{7}-{\frac{1}{5}}\mathopen{}\left(\cos\mathopen{}\left(x\right)\right)^{5}+C\)
6.3.4.8.
Answer.
\({\frac{1}{8}}\mathopen{}\left(\cos\mathopen{}\left(x\right)\right)^{8}-{\frac{1}{6}}\mathopen{}\left(\cos\mathopen{}\left(x\right)\right)^{6}+C\)
6.3.4.9.
Answer.
\({\frac{1}{11}}\mathopen{}\left(\sin\mathopen{}\left(x\right)\right)^{11}-{\frac{2}{9}}\mathopen{}\left(\sin\mathopen{}\left(x\right)\right)^{9}+{\frac{1}{7}}\mathopen{}\left(\sin\mathopen{}\left(x\right)\right)^{7}+C\)
6.3.4.10.
Answer.
\(-0.111111\sin^{9}\mathopen{}\left(x\right)+0.428571\sin^{7}\mathopen{}\left(x\right)-0.6\sin^{5}\mathopen{}\left(x\right)+0.333333\sin^{3}\mathopen{}\left(x\right)+C\)
6.3.4.11.
Answer.
\(\frac{x}{8}-0.03125\sin\mathopen{}\left(4x\right)+C\)
6.3.4.12.
Answer.
\(0.5\mathopen{}\left(-0.125\cos\mathopen{}\left(8x\right)-0.5\cos\mathopen{}\left(2x\right)\right)+C\)
6.3.4.13.
Answer.
\(C-\left(\left({\frac{1}{4}}\right)\cos\mathopen{}\left(2x\right)+\left({\frac{1}{8}}\right)\cos\mathopen{}\left(4x\right)\right)\)
6.3.4.14.
Answer.
\(\left({\frac{1}{14}}\right)\sin\mathopen{}\left(7x\right)-\left({\frac{1}{22}}\right)\sin\mathopen{}\left(11x\right)+C\)
6.3.4.15.
Answer.
\(\frac{1}{12\pi }\sin\mathopen{}\left(6\pi x\right)-\frac{1}{16\pi }\sin\mathopen{}\left(8\pi x\right)+C\)
6.3.4.16.
Answer.
\(0.5\mathopen{}\left(\sin\mathopen{}\left(x\right)+0.333333\sin\mathopen{}\left(3x\right)\right)+C\)
6.3.4.17.
Answer.
\(\frac{3}{4\pi }\cos\mathopen{}\left(\frac{2\pi }{3}\pi x\right)+\frac{3}{8\pi }\cos\mathopen{}\left(\frac{4\pi }{3}\pi x\right)+C\)
6.3.4.18.
Answer.
\(\frac{\tan^{5}\mathopen{}\left(x\right)}{5}+C\)
6.3.4.19.
Answer.
\(\frac{\tan^{5}\mathopen{}\left(x\right)}{5}+\frac{\tan^{3}\mathopen{}\left(x\right)}{3}+C\)
6.3.4.20.
Answer.
\({\frac{1}{10}}\mathopen{}\left(\tan\mathopen{}\left(x\right)\right)^{10}+{\frac{1}{8}}\mathopen{}\left(\tan\mathopen{}\left(x\right)\right)^{8}+C\)
6.3.4.21.
Answer.
\({\frac{1}{9}}\mathopen{}\left(\tan\mathopen{}\left(x\right)\right)^{9}+C\)
6.3.4.22.
Answer.
\({\frac{1}{11}}\mathopen{}\left(\sec\mathopen{}\left(x\right)\right)^{11}-{\frac{1}{9}}\mathopen{}\left(\sec\mathopen{}\left(x\right)\right)^{9}+C\)
6.3.4.23.
Answer.
\({\frac{1}{6}}\mathopen{}\left(\sec\mathopen{}\left(x\right)\right)^{6}-{\frac{1}{2}}\mathopen{}\left(\sec\mathopen{}\left(x\right)\right)^{4}+{\frac{1}{2}}\mathopen{}\left(\sec\mathopen{}\left(x\right)\right)^{2}+C\)
6.3.4.24.
Answer.
\(\frac{\tan^{3}\mathopen{}\left(x\right)}{3}-\tan\mathopen{}\left(x\right)+x+C\)
6.3.4.25.
Answer.
\(0.25\tan\mathopen{}\left(x\right)\sec^{3}\mathopen{}\left(x\right)+0.375\mathopen{}\left(\sec\mathopen{}\left(x\right)\tan\mathopen{}\left(x\right)+\ln\mathopen{}\left(\left|\sec\mathopen{}\left(x\right)+\tan\mathopen{}\left(x\right)\right|\right)\right)+C\)
6.3.4.26.
Answer.
\(0.5\mathopen{}\left(\sec\mathopen{}\left(x\right)\tan\mathopen{}\left(x\right)-\ln\mathopen{}\left(\left|\sec\mathopen{}\left(x\right)+\tan\mathopen{}\left(x\right)\right|\right)\right)+C\)
6.3.4.27.
Answer.
\(0.25\tan\mathopen{}\left(x\right)\sec^{3}\mathopen{}\left(x\right)-0.125\mathopen{}\left(\sec\mathopen{}\left(x\right)\tan\mathopen{}\left(x\right)+\ln\mathopen{}\left(\left|\sec\mathopen{}\left(x\right)+\tan\mathopen{}\left(x\right)\right|\right)\right)+C\)
6.3.4.28.
Answer.
\({\frac{1}{5}}\)
6.3.4.29.
Answer.
\(0\)
6.3.4.30.
Answer.
\(0\)
6.3.4.31.
Answer.
\(0\)
6.3.4.32.
Answer.
\({\frac{2}{3}}\)
6.3.4.33.
Answer.
\({\frac{1}{5}}\)
6.3.4.34.
Answer.
\({\frac{8}{15}}\)
6.4 Trigonometric Substitution
Exercises
Terms and Concepts
6.4.1.
Answer.
\(\text{backward}\)
6.4.2.
Answer.
\(6\sin\mathopen{}\left(\theta\right)\hbox{ or }6\cos\mathopen{}\left(\theta\right)\)
6.4.3.
Answer 1.
\(\tan^{2}\mathopen{}\left(\theta\right)+1 = \sec^{2}\mathopen{}\left(\theta\right)\)
Answer 2.
\(6\sec^{2}\mathopen{}\left(\theta\right)\)
Problems
6.4.5.
Answer.
\({\frac{1}{2}}\mathopen{}\left(x\sqrt{x^{2}+1}+\ln\mathopen{}\left(\sqrt{x^{2}+1}+x\right)\right)+C\)
6.4.6.
Answer.
\(\frac{x}{2}\sqrt{x^{2}+4}+2\ln\mathopen{}\left(\frac{\sqrt{x^{2}+4}}{2}+\frac{x}{2}\right)+C\)
6.4.7.
Answer.
\({\frac{1}{2}}\sin^{-1}\mathopen{}\left(x\right)+\frac{x}{2}\sqrt{1-x^{2}}+C\)
6.4.8.
Answer.
\({\frac{9}{2}}\sin^{-1}\mathopen{}\left(\frac{x}{3}\right)+\frac{x}{2}\sqrt{9-x^{2}}+C\)
6.4.9.
Answer.
\({\frac{1}{2}}x\sqrt{x^{2}-1}-{\frac{1}{2}}\ln\mathopen{}\left(\left|x+\sqrt{x^{2}-1}\right|\right)+C\)
6.4.10.
Answer.
\({\frac{1}{2}}x\sqrt{x^{2}-16}-8\ln\mathopen{}\left(\left|\frac{x}{4}+\frac{\sqrt{x^{2}-16}}{4}\right|\right)+C\)
6.4.11.
Answer.
\(\frac{x}{2}\sqrt{36x^{2}+1}+{\frac{1}{12}}\ln\mathopen{}\left(6x+\sqrt{36x^{2}+1}\right)+C\)
6.4.12.
Answer.
\(\frac{x}{2}\sqrt{1-36x^{2}}+{\frac{1}{12}}\sin^{-1}\mathopen{}\left(6x\right)+C\)
6.4.13.
Answer.
\(\frac{x}{2}\sqrt{49x^{2}-1}-{\frac{1}{14}}\ln\mathopen{}\left(\left|7x+\sqrt{49x^{2}-1}\right|\right)+C\)
6.4.14.
Answer.
\(8\ln\mathopen{}\left(\frac{x}{1.73205}+\sqrt{\frac{x^{2}}{3}+1}\right)+C\)
6.4.15.
Answer.
\(9\sin^{-1}\mathopen{}\left(\frac{x}{3.60555}\right)+C\)
6.4.16.
Answer.
\(2\ln\mathopen{}\left(\left|\frac{x}{2.64575}+\sqrt{\frac{x^{2}}{7}-1}\right|\right)+C\)
6.4.17.
Answer.
\(\sqrt{x^{2}-3}-1.73205\sec^{-1}\mathopen{}\left(\frac{x}{1.73205}\right)+C\)
6.4.18.
Answer.
\({\frac{1}{2}}\tan^{-1}\mathopen{}\left(x\right)+\frac{x}{2\mathopen{}\left(x^{2}+1\right)}+C\)
6.4.19.
Answer.
\(\sqrt{x^{2}-6}+C\)
6.4.20.
Answer.
\({\frac{1}{8}}\sin^{-1}\mathopen{}\left(x\right)+\frac{x}{8}\sqrt{1-x^{2}}\mathopen{}\left(2x^{2}-1\right)+C\)
6.4.21.
Answer.
\(C-\frac{1}{\sqrt{x^{2}+36}}\)
6.4.22.
Answer.
\(\frac{7x}{2}\sqrt{x^{2}-6}+21\ln\mathopen{}\left(\left|\frac{x}{2.44949}+\sqrt{\frac{x^{2}}{6}-1}\right|\right)+C\)
6.4.23.
Answer.
\(\left({\frac{1}{162}}\right)\frac{x-6}{x^{2}-12x+117}+\left({\frac{1}{1458}}\right)\tan^{-1}\mathopen{}\left(\frac{x-6}{9}\right)+C\)
6.4.24.
Answer.
\(\frac{x}{\sqrt{1-x^{2}}}-\sin^{-1}\mathopen{}\left(x\right)+C\)
6.4.25.
Answer.
\(C-\left(\frac{\sqrt{5-x^{2}}}{2x}+{\frac{1}{2}}\sin^{-1}\mathopen{}\left(\frac{x}{2.23607}\right)\right)\)
6.4.26.
Answer.
\(\frac{x}{2}\sqrt{x^{2}+3}-\left({\frac{3}{2}}\right)\ln\mathopen{}\left(\frac{x}{1.73205}+\sqrt{\frac{x^{2}}{3}+1}\right)+C\)
6.4.27.
Answer.
\(\frac{\pi }{2}\)
6.4.28.
Answer.
\(\left({\frac{7}{2}}\right)\sqrt{33}-8\ln\mathopen{}\left(\left|\left({\frac{7}{4}}\right)+\left({\frac{1}{4}}\right)\sqrt{33}\right|\right)\)
6.4.29.
Answer.
\(\left({\frac{5}{2}}\right)\sqrt{29}+2\ln\mathopen{}\left(\left({\frac{5}{2}}\right)+\left({\frac{1}{2}}\right)\sqrt{29}\right)\)
6.4.30.
Answer.
\(\tan^{-1}\mathopen{}\left(7\right)+\left({\frac{7}{50}}\right)\)
6.4.31.
Answer.
\(9\sin^{-1}\mathopen{}\left(\left({\frac{2}{3}}\right)\right)+2\sqrt{5}\)
6.4.32.
Answer.
\(\frac{\pi }{8}\)
6.5 Partial Fraction Decomposition
Exercises
Terms and Concepts
6.5.1.
Answer.
\(\text{rational}\)
6.5.2.
Answer.
\(\text{True}\)
6.5.3.
Answer.
\(\frac{A}{x}+\frac{B}{x-6}\)
6.5.4.
Answer.
\(\frac{A}{x-3}+\frac{B}{x+3}\)
6.5.5.
Answer.
\(\frac{A}{x-\sqrt{6}}+\frac{B}{x+\sqrt{6}}\)
6.5.6.
Answer.
\(\frac{A}{x}+\frac{Bx+C}{x^{2}+5}\)
Problems
6.5.7.
Answer.
\(5\ln\mathopen{}\left(\left|x+3\right|\right)+9\ln\mathopen{}\left(\left|x-2\right|\right)+C\)
6.5.8.
Answer.
\(8\ln\mathopen{}\left(\left|x\right|\right)-8\ln\mathopen{}\left(\left|x-4\right|\right)+C\)
6.5.9.
Answer.
\(\left({\frac{3}{4}}\right)\ln\mathopen{}\left(\left|x-2\right|\right)-\left({\frac{3}{4}}\right)\ln\mathopen{}\left(\left|x+2\right|\right)+C\)
6.5.10.
Answer.
\(\ln\mathopen{}\left(\left|x-8\right|\right)+\ln\mathopen{}\left(\left|1-4x\right|\right)+C\)
6.5.11.
Answer.
\(\ln\mathopen{}\left(\left|x+9\right|\right)-\frac{3}{x+9}+C\)
6.5.12.
Answer.
\(7\ln\mathopen{}\left(\left|x+7\right|\right)-\frac{5}{x+7}+C\)
6.5.13.
Answer.
\(3\ln\mathopen{}\left(\left|x\right|\right)+\ln\mathopen{}\left(\left|x+4\right|\right)+\frac{4}{x+4}+C\)
6.5.14.
Answer.
\(C-\left(2\ln\mathopen{}\left(\left|9-3x\right|\right)+\ln\mathopen{}\left(\left|x+3\right|\right)+5\ln\mathopen{}\left(\left|x-9\right|\right)\right)\)
6.5.15.
Answer.
\(\left({\frac{1}{7}}\right)\ln\mathopen{}\left(\left|7x+1\right|\right)-\left({\frac{2}{5}}\right)\ln\mathopen{}\left(\left|5x+3\right|\right)+\frac{\left({\frac{1}{3}}\right)}{9x-9}+C\)
6.5.16.
Answer.
\(x-2\ln\mathopen{}\left(\left|x-2\right|\right)-\ln\mathopen{}\left(\left|x+5\right|\right)+C\)
6.5.17.
Answer.
\({\frac{1}{2}}x^{2}+12x-16\ln\mathopen{}\left(\left|x-4\right|\right)+128\ln\mathopen{}\left(\left|x-8\right|\right)+C\)
6.5.18.
Answer.
\(2x+C\)
6.5.19.
Answer.
\(\left({\frac{1}{18}}\right)\ln\mathopen{}\left(\left|x\right|\right)-\left({\frac{1}{36}}\right)\ln\mathopen{}\left(x^{2}-8x+18\right)+0.157135\tan^{-1}\mathopen{}\left(\frac{x-4}{1.41421}\right)+C\)
6.5.20.
Answer.
\(x+4\ln\mathopen{}\left(x^{2}+8x+22\right)-15.1052\tan^{-1}\mathopen{}\left(\frac{x+4}{2.44949}\right)+C\)
6.5.21.
Answer.
\(\ln\mathopen{}\left(\left|3x^{2}+x-4\right|\right)-2\ln\mathopen{}\left(\left|x-9\right|\right)+C\)
6.5.22.
Answer.
\(5\ln\mathopen{}\left(\left|x+6\right|\right)+4\ln\mathopen{}\left(x^{2}+4x+5\right)-2\tan^{-1}\mathopen{}\left(x+2\right)+C\)
6.5.23.
Answer.
\(\left({\frac{129}{58}}\right)\ln\mathopen{}\left(\left|x-7\right|\right)+\left({\frac{45}{116}}\right)\ln\mathopen{}\left(x^{2}+9\right)+\left({\frac{199}{174}}\right)\tan^{-1}\mathopen{}\left(\frac{x}{3}\right)+C\)
6.5.24.
Answer.
\(\ln\mathopen{}\left(x^{2}-2x+5\right)-\ln\mathopen{}\left(\left|x+4\right|\right)-2\tan^{-1}\mathopen{}\left(\frac{x-1}{2}\right)+C\)
6.5.25.
Answer.
\(4\ln\mathopen{}\left(\left|x+9\right|\right)-2\ln\mathopen{}\left(x^{2}-2x+4\right)+2.88675\tan^{-1}\mathopen{}\left(\frac{x-1}{1.73205}\right)+C\)
6.5.26.
Answer.
\(\ln\mathopen{}\left(\left|x+1\right|\right)-\left({\frac{3}{2}}\right)\ln\mathopen{}\left(x^{2}-8x+21\right)-0.894427\tan^{-1}\mathopen{}\left(\frac{x-4}{2.23607}\right)+C\)
6.5.27.
Answer.
\(\ln\mathopen{}\left(\left({\frac{48828125}{14155776}}\right)\right)\)
6.5.28.
Answer.
\(-4.35712\)
6.5.29.
Answer.
\(\ln\mathopen{}\left(\left({\frac{5}{7}}\right)\right)+\tan^{-1}\mathopen{}\left(5\right)-\tan^{-1}\mathopen{}\left(3\right)\)
6.5.30.
Answer.
\({\frac{1}{8}}\)
6.6 Hyperbolic Functions
6.6.3 Exercises
Problems
6.6.3.11.
Answer.
\(2\cosh\mathopen{}\left(2x\right)\)
6.6.3.12.
Answer.
\(2\cosh\mathopen{}\left(x\right)\sinh\mathopen{}\left(x\right)\)
6.6.3.13.
Answer.
\(\mathop{\rm sech}\nolimits^{2}\mathopen{}\left(x^{2}\right)\cdot 2x\)
6.6.3.14.
Answer.
\(\frac{1}{\sinh\mathopen{}\left(x\right)}\cosh\mathopen{}\left(x\right)\)
6.6.3.15.
Answer.
\(\cosh\mathopen{}\left(x\right)\cosh\mathopen{}\left(x\right)+\sinh\mathopen{}\left(x\right)\sinh\mathopen{}\left(x\right)\)
6.6.3.16.
Answer.
\(\sinh\mathopen{}\left(x\right)+x\cosh\mathopen{}\left(x\right)-\sinh\mathopen{}\left(x\right)\)
6.6.3.17.
Answer.
\(-\frac{1}{x^{2}\sqrt{1-\left(x^{2}\right)^{2}}}\cdot 2x\)
6.6.3.18.
Answer.
\(3\frac{1}{\sqrt{1+\left(3x\right)^{2}}}\)
6.6.3.19.
Answer.
\(\frac{1}{\sqrt{\left(2x^{2}\right)^{2}-1}}\cdot 2\cdot 2x\)
6.6.3.20.
Answer.
\(\frac{1}{1-\left(x+5\right)^{2}}\)
6.6.3.21.
Answer.
\(-\frac{1}{1-\cos^{2}\mathopen{}\left(x\right)}\sin\mathopen{}\left(x\right)\)
6.6.3.22.
Answer.
\(\frac{1}{\sqrt{\sec^{2}\mathopen{}\left(x\right)-1}}\sec\mathopen{}\left(x\right)\tan\mathopen{}\left(x\right)\)
6.6.3.23.
Answer.
\(1\mathopen{}\left(x-0\right)+0\)
6.6.3.24.
Answer.
\(0.75\mathopen{}\left(x-0.693147\right)+1.25\)
6.6.3.25.
Answer.
\(0.36\mathopen{}\left(x-\left(-1.09861\right)\right)+\left(-0.8\right)\)
6.6.3.26.
Answer.
\(-0.576\mathopen{}\left(x-1.09861\right)+0.36\)
6.6.3.27.
Answer.
\(1\mathopen{}\left(x-0\right)+0\)
6.6.3.28.
Answer.
\(1\mathopen{}\left(x-1.41421\right)+0.881374\)
6.6.3.29.
Answer.
\(0.5\ln\mathopen{}\left(\cosh\mathopen{}\left(2x\right)\right)+C\)
6.6.3.30.
Answer.
\(0.333333\sinh\mathopen{}\left(3x-7\right)+C\)
6.6.3.31.
Answer.
\(0.5\sinh^{2}\mathopen{}\left(x\right)+C\)
6.6.3.32.
Answer.
\(x\sinh\mathopen{}\left(x\right)-\cosh\mathopen{}\left(x\right)+C\)
6.6.3.33.
Answer.
\(x\cosh\mathopen{}\left(x\right)-\sinh\mathopen{}\left(x\right)+C\)
6.6.3.34.
Answer.
\(\sinh^{-1} x +C=\ln\big(x+\sqrt{x^2+1}\big)+C\)
6.6.3.35.
Answer.
\(\cosh^{-1} x/3 +C=\ln\big(x+\sqrt{x^2-9}\big)+C\)
6.6.3.36.
Answer.
\(0.5\ln\mathopen{}\left(\left|x+1\right|\right)-0.5\ln\mathopen{}\left(\left|x-1\right|\right)+C\)
6.6.3.37.
Answer.
\(\cosh^{-1}\mathopen{}\left(\frac{x^{2}}{2}\right)+C\)
6.6.3.38.
Answer.
\(0.666667\sinh^{-1}\mathopen{}\left(x^{1.5}\right)+C\)
6.6.3.39.
Answer.
\(-0.0625\tan^{-1}\mathopen{}\left(\frac{x}{2}\right)+0.03125\ln\mathopen{}\left(\left|x-2\right|\right)-0.03125\ln\mathopen{}\left(\left|x+2\right|\right)+C\)
6.6.3.40.
Answer.
\(\ln\mathopen{}\left(x\right)-\ln\mathopen{}\left(\left|x+1\right|\right)+C\)
6.6.3.41.
Answer.
\(\tan^{-1}\mathopen{}\left(e^{x}\right)+C\)
6.6.3.42.
Answer.
\(x\sinh^{-1}\mathopen{}\left(x\right)-\sqrt{x^{2}+1}+C\)
6.6.3.43.
Answer.
\(x\tanh^{-1}\mathopen{}\left(x\right)+0.5\ln\mathopen{}\left(\left|x^{2}-1\right|\right)+C\)
6.6.3.44.
Answer.
\(\tan^{-1}\mathopen{}\left(\sinh\mathopen{}\left(x\right)\right)+C\)
6.6.3.45.
Answer.
\(0\)
6.6.3.46.
Answer.
\(1.5\)
6.6.3.47.
Answer.
\(0.761594\)
6.6.3.48.
Answer.
\(1.44364\)
6.7 L’Hospital’s Rule
6.7.4 Exercises
Terms and Concepts
6.7.4.2.
Answer.
\(\text{False}\)
6.7.4.3.
Answer.
\(\text{False}\)
Problems
6.7.4.9.
Answer.
\(3\)
6.7.4.10.
Answer.
\(-1.66667\)
6.7.4.11.
Answer.
\(-1\)
6.7.4.12.
Answer.
\(-0.707107\)
6.7.4.13.
Answer.
\(5\)
6.7.4.14.
Answer.
\(0\)
6.7.4.15.
Answer.
\(0.666667\)
6.7.4.16.
Answer.
\(\frac{a\cos\mathopen{}\left(a\cdot 0\right)}{b\cos\mathopen{}\left(b\cdot 0\right)}\)
6.7.4.17.
Answer.
\(\infty \)
6.7.4.18.
Answer.
\(0.5\)
6.7.4.19.
Answer.
\(0\)
6.7.4.20.
Answer.
\(0\)
6.7.4.21.
Answer.
\(0\)
6.7.4.23.
Answer.
\(\infty \)
6.7.4.24.
Answer.
\(\infty \)
6.7.4.25.
Answer.
\(0\)
6.7.4.26.
Answer.
\(2\)
6.7.4.27.
Answer.
\(-2\)
6.7.4.28.
Answer.
\(0\)
6.7.4.29.
Answer.
\(0\)
6.7.4.30.
Answer.
\(0\)
6.7.4.31.
Answer.
\(0\)
6.7.4.32.
Answer.
\(0\)
6.7.4.33.
Answer.
\(\infty \)
6.7.4.34.
Answer.
\(\infty \)
6.7.4.35.
Answer.
\(\infty \)
6.7.4.36.
Answer.
\(0\)
6.7.4.37.
Answer.
\(0\)
6.7.4.38.
Answer.
\(e\)
6.7.4.39.
Answer.
\(1\)
6.7.4.40.
Answer.
\(1\)
6.7.4.41.
Answer.
\(1\)
6.7.4.42.
Answer.
\(1\)
6.7.4.43.
Answer.
\(1\)
6.7.4.44.
Answer.
\(0\)
6.7.4.45.
Answer.
\(1\)
6.7.4.46.
Answer.
\(1\)
6.7.4.47.
Answer.
\(1\)
6.7.4.48.
Answer.
\(1\)
6.7.4.49.
Answer.
\(2\)
6.7.4.50.
Answer.
\(\frac{1}{2}\)
6.7.4.51.
Answer.
\(-\infty \)
6.7.4.52.
Answer.
\(1\)
6.7.4.53.
Answer.
\(0\)
6.7.4.54.
Answer.
\(3\)
6.8 Improper Integration
6.8.4 Exercises
Terms and Concepts
6.8.4.4.
Answer.
\(p\gt 1\)
6.8.4.5.
Answer.
\(p\gt 1\)
6.8.4.6.
Answer.
\(p\lt 1\)
Problems
6.8.4.7.
Answer.
\(\frac{e^{5}}{2}\)
6.8.4.8.
Answer.
\(\frac{1}{2}\)
6.8.4.9.
Answer.
\(\frac{1}{3}\)
6.8.4.10.
Answer.
\(\frac{\pi }{3}\)
6.8.4.11.
Answer.
\(\frac{1}{\ln\mathopen{}\left(2\right)}\)
6.8.4.12.
Answer.
\(\infty \)
6.8.4.13.
Answer.
\(\infty \)
6.8.4.14.
Answer.
\(\infty \)
6.8.4.15.
Answer.
\(1\)
6.8.4.16.
Answer.
\(\infty \)
6.8.4.17.
Answer.
\(\infty \)
6.8.4.18.
Answer.
\(\infty \)
6.8.4.19.
Answer.
\(\infty \)
6.8.4.20.
Answer.
\(\infty \)
6.8.4.21.
Answer.
\(\infty \)
6.8.4.22.
Answer.
\(2+2\sqrt{2}\)
6.8.4.23.
Answer.
\(1\)
6.8.4.24.
Answer.
\(\frac{1}{2}\)
6.8.4.25.
Answer.
\(0\)
6.8.4.26.
Answer.
\(\frac{\pi }{2}\)
6.8.4.27.
Answer.
\(\frac{-1}{4}\)
6.8.4.28.
Answer.
\(\frac{-1}{9}\)
6.8.4.29.
Answer.
\(\infty \)
6.8.4.30.
Answer.
\(-1\)
6.8.4.31.
Answer.
\(1\)
6.8.4.32.
Answer.
\(\infty \)
6.8.4.33.
Answer.
\(\frac{1}{2}\)
6.8.4.34.
Answer.
\(\frac{1}{2}\)
6.8.4.35.
Answer 1.
\(\text{Limit Comparison Test}\)
Answer 2.
\(\text{diverges}\)
Answer 3.
\(\frac{1}{x}\)
6.8.4.36.
Answer 1.
\(\text{Limit Comparison Test}\)
Answer 2.
\(\text{converges}\)
Answer 3.
\(\frac{1}{x^{1.5}}\)
6.8.4.37.
Answer 1.
\(\text{Limit Comparison Test}\)
Answer 2.
\(\text{diverges}\)
Answer 3.
\(\frac{1}{x}\)
6.8.4.38.
Answer 1.
\(\text{Direct Comparison Test}\)
Answer 2.
\(\text{converges}\)
Answer 3.
\(xe^{-x}\)
6.8.4.39.
Answer 1.
\(\text{Direct Comparison Test}\)
Answer 2.
\(\text{converges}\)
Answer 3.
\(e^{-x}\)
6.8.4.40.
Answer 1.
\(\text{Direct Comparison Test}\)
Answer 2.
\(\text{converges}\)
Answer 3.
\(xe^{-x}\)
6.8.4.41.
Answer 1.
\(\text{Direct Comparison Test}\)
Answer 2.
\(\text{converges}\)
Answer 3.
\(\frac{1}{x^{2}-1}\)
6.8.4.42.
Answer 1.
\(\text{Direct Comparison Test}\)
Answer 2.
\(\text{diverges}\)
Answer 3.
\(\frac{x}{x^{2}+1}\)
6.8.4.43.
Answer 1.
\(\text{Direct Comparison Test}\)
Answer 2.
\(\text{converges}\)
Answer 3.
\(\frac{1}{e^{x}}\)
6.8.4.44.
Answer 1.
\(\text{Limit Comparison Test}\)
Answer 2.
\(\text{converges}\)
Answer 3.
\(\frac{1}{e^{x}}\)
7 Applications of Integration
7.1 Area Between Curves
Exercises
Terms and Concepts
7.1.1.
Answer.
\(\text{True}\)
7.1.2.
Answer.
\(\text{True}\)
Problems
7.1.5.
Answer.
\(22.436\)
7.1.6.
Answer.
\(5.33333\)
7.1.7.
Answer.
\(3.14159\)
7.1.8.
Answer.
\(3.14159\)
7.1.9.
Answer.
\(0.5\)
7.1.10.
Answer.
\(2.82843\)
7.1.11.
Answer.
\(0.721354\)
7.1.12.
Answer.
\(4/3\)
7.1.13.
Answer.
\(4.5\)
7.1.14.
Answer.
\(1.33333\)
7.1.15.
Answer.
\(0.429204\)
7.1.16.
Answer.
\(8\)
7.1.17.
Answer.
\(0.166667\)
7.1.18.
Answer.
\(3.08333\)
7.1.19.
Answer.
All enclosed regions have the same area, with regions being the reflection of adjacent regions. One region is formed on \([\pi/4,5\pi/4]\text{,}\) with area \(2\sqrt{2}\text{.}\)
7.1.20.
Answer.
\(3.89711\)
7.1.21.
Answer.
\(1\)
7.1.22.
Answer.
\(1.66667\)
7.1.23.
Answer.
\(4.5\)
7.1.24.
Answer.
\(2.25\)
7.1.25.
Answer.
\(0.514298\)
7.1.26.
Answer.
\(4/3\)
7.1.27.
Answer.
\(1\)
7.1.28.
Answer.
\(5\)
7.1.29.
Answer.
\(4\)
7.1.30.
Answer.
\(10.5\)
7.1.31.
Answer.
\(262800\ {\rm ft^{2}}\)
7.1.32.
Answer.
\(623333\ {\rm ft^{2}}\)
7.2 Volume by Cross-Sectional Area; Disk and Washer Methods
Exercises
Terms and Concepts
7.2.1.
Answer.
T
7.2.2.
Answer.
Answers will vary.
Problems
7.2.4.
Answer.
\(48\pi\sqrt{3}/5\) units\(^3\)
7.2.5.
Answer.
\(175\pi/3\) units\(^3\)
7.2.6.
Answer.
\(\pi^2/4\) units\(^3\)
7.2.7.
Answer.
\(\pi/6\) units\(^3\)
7.2.8.
Answer.
\(9\pi/2\) units\(^3\)
7.2.9.
Answer.
\(35\pi/3\) units\(^3\)
7.2.10.
Answer.
\(\pi^2-2\pi\) units\(^3\)
7.2.11.
Answer.
\(2\pi/15\) units\(^3\)
7.2.12.
7.2.12.a
Answer.
\(\pi/2\)
7.2.12.b
Answer.
\(5\pi/6\)
7.2.12.c
Answer.
\(4\pi/5\)
7.2.12.d
Answer.
\(8\pi/15\)
7.2.13.
7.2.13.a
Answer.
\(512\pi/15\)
7.2.13.b
Answer.
\(256\pi/5\)
7.2.13.c
Answer.
\(832\pi/15\)
7.2.13.d
Answer.
\(128\pi/3\)
7.2.14.
7.2.14.a
Answer.
\(4\pi/3\)
7.2.14.b
Answer.
\(2\pi/3\)
7.2.14.c
Answer.
\(4\pi/3\)
7.2.14.d
Answer.
\(\pi/3\)
7.2.15.
7.2.15.a
Answer.
\(104\pi/15\)
7.2.15.b
Answer.
\(64\pi/15\)
7.2.15.c
Answer.
\(32\pi/5\)
7.2.16.
7.2.16.a
Answer.
\(\pi^2/2\)
7.2.16.b
Answer.
\(\pi^2/2-4\pi\sinh^{-1}(1)\)
7.2.16.c
Answer.
\(\pi^2/2+4\pi\sinh^{-1}(1)\)
7.2.17.
7.2.17.a
Answer.
\(8\pi\)
7.2.17.b
Answer.
\(8\pi\)
7.2.17.c
Answer.
\(16\pi/3\)
7.2.17.d
Answer.
\(8\pi/3\)
7.2.18.
Answer.
\(250\pi/3\)
7.2.19.
Answer.
\(250\pi/3\)
7.2.20.
Answer.
\(80/3\)
7.2.21.
Answer.
\(187.5\)
7.3 The Shell Method
Exercises
Terms and Concepts
7.3.1.
Answer.
T
7.3.2.
Answer.
F
7.3.3.
Answer.
F
7.3.4.
Answer.
T
Problems
7.3.5.
Answer.
\(9\pi/2\) units\(^3\)
7.3.6.
Answer.
\(70\pi/3\) units\(^3\)
7.3.7.
Answer.
\(\pi^2-2\pi\) units\(^3\)
7.3.8.
Answer.
\(2\pi/15\) units\(^3\)
7.3.9.
Answer.
\(48\pi\sqrt{3}/5\) units\(^3\)
7.3.10.
Answer.
\(350\pi/3\) units\(^3\)
7.3.11.
Answer.
\(\pi^2/4\) units\(^3\)
7.3.12.
Answer.
\(\pi/6\) units\(^3\)
7.3.13.
7.3.13.a
Answer.
\(4\pi/5\)
7.3.13.b
Answer.
\(8\pi/15\)
7.3.13.c
Answer.
\(\pi/2\)
7.3.13.d
Answer.
\(5\pi/6\)
7.3.14.
7.3.14.a
Answer.
\(128\pi/3\)
7.3.14.b
Answer.
\(128\pi/3\)
7.3.14.c
Answer.
\(512\pi/15\)
7.3.14.d
Answer.
\(256\pi/5\)
7.3.15.
7.3.15.a
Answer.
\(4\pi/3\)
7.3.15.b
Answer.
\(\pi/3\)
7.3.15.c
Answer.
\(4\pi/3\)
7.3.15.d
Answer.
\(2\pi/3\)
7.3.16.
7.3.16.a
Answer.
\(16\pi/3\)
7.3.16.b
Answer.
\(8\pi/3\)
7.3.16.c
Answer.
\(8\pi\)
7.3.17.
7.3.17.a
Answer.
\(2\pi(\sqrt{2}-1)\)
7.3.17.b
Answer.
\(2\pi(1-\sqrt{2}+\sinh^{-1}(1))\)
7.3.18.
7.3.18.a
Answer.
\(16\pi/3\)
7.3.18.b
Answer.
\(8\pi/3\)
7.3.18.c
Answer.
\(8\pi\)
7.3.18.d
Answer.
\(8\pi\)
7.4 Arc Length and Surface Area
7.4.3 Exercises
Problems
7.4.3.3.
Answer.
\(\sqrt{2}\)
7.4.3.4.
Answer.
\(6\)
7.4.3.5.
Answer.
\(\frac{10}{3}\)
7.4.3.6.
Answer.
\(6\)
7.4.3.7.
Answer.
\(\frac{157}{3}\)
7.4.3.8.
Answer.
\(\frac{3}{2}\)
7.4.3.9.
Answer.
\(\frac{12}{5}\)
7.4.3.10.
Answer.
\(\frac{7.99533\times 10^{7}}{400000}\)
7.4.3.11.
Answer.
\(-\ln(2-\sqrt{3}) \approx 1.31696\)
7.4.3.12.
Answer.
\(\sinh^{-1}(1)\)
7.4.3.13.
Answer.
\(\int_0^1 \sqrt{1+4x^2}\, dx\)
7.4.3.14.
Answer.
\(\int_0^1 \sqrt{1+100x^{18}}\, dx\)
7.4.3.15.
Answer.
\(\int_1^e \sqrt{1+\frac1{x^2}}\, dx\)
7.4.3.16.
Answer.
\(\int_{1}^2 \sqrt{1+\frac1{x^4}}\, dx\)
7.4.3.17.
Answer.
\(\int_0^{\pi/2}\sqrt{1+\sin^2(x)}\,dx\)
7.4.3.18.
Answer.
\(\int_{-\pi/4}^{\pi/4} \sqrt{1+\sec^2(x) \tan^2(x) }\, dx\)
7.4.3.19.
Answer.
\(1.4790\)
7.4.3.20.
Answer.
\(1.8377\)
7.4.3.21.
Answer.
\(2.1300\)
7.4.3.22.
Answer.
\(1.3254\)
7.4.3.23.
Answer.
\(1.00013\)
7.4.3.24.
Answer.
\(1.7625\)
7.4.3.25.
Answer.
\(2\pi\int_0^1 2x\sqrt{5}\, dx = 2\pi\sqrt{5}\)
7.4.3.26.
Answer.
\(2\pi\int_0^1 x\sqrt{5}\, dx = \pi\sqrt{5}\)
7.4.3.27.
Answer.
\(2\pi\int_0^1 x\sqrt{1+4x^2}\, dx = \pi/6(5\sqrt{5}-1)\)
7.4.3.28.
Answer.
\(2\pi\int_0^1 x^3\sqrt{1+9x^4}\, dx = \pi/27(10\sqrt{10}-1)\)
7.4.3.29.
Answer.
\(\int_0^1 \sqrt{1+\frac{1}{4x}}\, dx\)
7.4.3.30.
Answer.
\(\int_{-1}^1 \sqrt{1+\frac{x^2}{1-x^2}}\, dx\)
7.4.3.31.
Answer.
\(\int_{-3}^3 \sqrt{1+\frac{x^2}{81-9x^2}}\, dx\)
7.4.3.32.
Answer.
\(2\pi\int_0^1 \sqrt{x}\sqrt{1+1/(4x)}\, dx = \pi/6(5\sqrt{5}-1)\)
7.4.3.33.
Answer.
\(2\pi\int_0^1 \sqrt{1-x^2}\sqrt{1+x/(1-x^2)}\, dx = 4\pi\)
7.5 Work
7.5.4 Exercises
Terms and Concepts
7.5.4.1.
Answer.
In SI units, it is one joule, i.e., one newton–meter, or kg·m⁄s2m In Imperial Units, it is ft–lb.
7.5.4.2.
Answer.
The same.
7.5.4.3.
Answer.
Smaller.
7.5.4.4.
Answer.
force; distance
Problems
7.5.4.5.
7.5.4.5.a
Answer.
500 ft–lb
7.5.4.5.b
Answer.
\(100-50\sqrt{2} \approx 29.29\) ft
7.5.4.6.
7.5.4.6.a
Answer.
2450 J
7.5.4.6.b
Answer.
1568 J
7.5.4.7.
7.5.4.7.a
Answer.
\(\frac12\cdot d\cdot l^2\) ft–lb
7.5.4.7.b
Answer.
75 %
7.5.4.7.c
Answer.
\(\ell(1-\sqrt{2}/2) \approx 0.2929\ell\)
7.5.4.8.
Answer.
735 J
7.5.4.9.
7.5.4.9.a
Answer.
756 ft–lb
7.5.4.9.b
Answer.
60,000 ft–lb
7.5.4.9.c
Answer.
Yes, for the cable accounts for about 1% of the total work.
7.5.4.10.
Answer.
11,100 ft–lb
7.5.4.11.
Answer.
575 ft–lb
7.5.4.12.
Answer.
125 ft–lb
7.5.4.13.
Answer.
0.05 J
7.5.4.14.
Answer.
12.5 ft–lb
7.5.4.15.
Answer.
5/3 ft–lb
7.5.4.16.
Answer.
0.2625 = 21/80 J
7.5.4.17.
Answer.
\(f\cdot d/2\) J
7.5.4.18.
Answer.
45 ft–lb
7.5.4.19.
Answer.
5 ft–lb
7.5.4.20.
Answer.
\(953,284\) J
7.5.4.21.
7.5.4.21.a
Answer.
52,929.6 ft–lb
7.5.4.21.b
Answer.
18,525.3 ft–lb
7.5.4.21.c
Answer.
When 3.83 ft of water have been pumped from the tank, leaving about 2.17 ft in the tank.
7.5.4.22.
Answer.
192,767 ft–lb. Note that the tank is oriented horizontally. Let the origin be the center of one of the circular ends of the tank. Since the radius is 3.75 ft, the fluid is being pumped to \(y=4.75\text{;}\) thus the distance the gas travels is \(h(y)=4.75-y\text{.}\) A differential element of water is a rectangle, with length 20 and width \(2\sqrt{3.75^2-y^2}\text{.}\) Thus the force required to move that slab of gas is \(F(y) = 40\cdot45.93\cdot\sqrt{3.75^2-y^2}dy\text{.}\) Total work is \(\int_{-3.75}^{3.75} 40\cdot45.93\cdot(4.75-y)\sqrt{3.75^2-y^2}\, dy\text{.}\) This can be evaluated without actual integration; split the integral into \(\int_{-3.75}^{3.75} 40\cdot45.93\cdot(4.75)\sqrt{3.75^2-y^2}\, dy + \int_{-3.75}^{3.75} 40\cdot45.93\cdot(-y)\sqrt{3.75^2-y^2}\, dy\text{.}\) The first integral can be evaluated as measuring half the area of a circle; the latter integral can be shown to be 0 without much difficulty. (Use substitution and realize the bounds are both 0.)
7.5.4.23.
Answer.
212,135 ft–lb
7.5.4.24.
7.5.4.24.a
Answer.
approx. 577,000 J
7.5.4.24.b
Answer.
approx. 399,000 J
7.5.4.24.c
Answer.
approx 110,000 J (By volume, half of the water is between the base of the cone and a height of 3.9685 m. If one rounds this to 4 m, the work is approx 104,000 J.)
7.5.4.25.
Answer.
187,214 ft–lb
7.5.4.26.
Answer.
617,400 J
7.5.4.27.
Answer.
4,917,150 J
7.6 Fluid Forces
Exercises
Terms and Concepts
7.6.1.
Answer.
Answers will vary.
7.6.2.
Answer.
Answers will vary.
Problems
7.6.3.
Answer.
499.2 lb
7.6.4.
Answer.
249.6 lb
7.6.5.
Answer.
6739.2 lb
7.6.6.
Answer.
5241.6 lb
7.6.7.
Answer.
3920.7 lb
7.6.8.
Answer.
15682.8 lb
7.6.9.
Answer.
2496 lb
7.6.10.
Answer.
2496 lb
7.6.11.
Answer.
602.59 lb
7.6.12.
Answer.
291.2 lb
7.6.13.
Answer.
- 2340 lb
- 5625 lb
7.6.14.
Answer.
- 1064.96 lb
- 2560 lb
7.6.15.
Answer.
- 1597.44 lb
- 3840 lb
7.6.16.
Answer.
- 41.6 lb
- 100 lb
7.6.17.
Answer.
- 56.42 lb
- 135.62 lb
7.6.18.
Answer.
- 1123.2 lb
- 2700 lb
7.6.19.
Answer.
5.1 ft
7.6.20.
Answer.
4.1 ft
8 Differential Equations
8.1 Graphical and Numerical Solutions to Differential Equations
8.1.4 Exercises
Terms and Concepts
8.1.4.1.
Answer.
An initial value problems is a differential equation that is paired with one or more initial conditions. A differential equation is simply the equation without the initial conditions.
8.1.4.2.
Answer.
Answers will vary.
8.1.4.3.
Answer.
Substitute the proposed function into the differential equation, and show the the statement is satisfied.
8.1.4.4.
Answer.
A particular solution is one specifica member of a family of solutions, and has no arbitrary constants. A general solution is a family of solutions, includes all possible solutions to the differential equation, and typically includes one or more arbitrary constants.
8.1.4.5.
Answer.
Many differential equations are impossible to solve analytically.
8.1.4.6.
Answer.
A smaller \(h\) value leads to a numerical solution that is closer to the true solution, but decreasing the \(h\) value leads to more computational effort.
Problems
8.1.4.7.
Answer.
Answers will vary.
8.1.4.8.
Answer.
Answers will vary.
8.1.4.9.
Answer.
Answers will vary.
8.1.4.10.
Answer.
Answers will vary.
8.1.4.11.
Answer.
\(C = 2\)
8.1.4.12.
Answer.
\(C = 6\)
8.1.4.13.
Answer.
The \(x\) and \(y\) axes are uncalibrated.In the first quadrant in the top left, the field lines are north-east facing and in the bottom right they are southeast facing. In the second quadrant the field lines are all north-east facing. In the third quadrant like in the first quadrant in the top left the field lines are northeast facing and in the bottom right they are southeast facing. In the fourth quadrant all lines are southeast facing.
8.1.4.14.
Answer.
The \(x\) and \(y\) axes are uncalibrated. The field lines form concentric ovals facing away from the origin on both positive and negative \(x\) and \(y\) axes. The concentric shorter arcs are on either end of the \(x\) axis. On the two ends of the \(y\) axis concentric wider arcs are drawn. The field lines intermix to form an ’X’ with centre at the origin.
8.1.4.15.
Answer.
The \(x\) and \(y\) axes are uncalibrated. There are five instances where the field lines run parallel to the \(x\) axis. One of them is on the \(x\) axis itself, other two pairs of such field lines are above and below the \(x\) axis. In between the \(x\) axis and the first horizontal field line for some positive \(y\) value, the field lines are all northeast facing. Above the horizontal field line for some \(y\) value until another with a higher \(y\) value, the field lines in between are southeast facing.
Similarly below the \(x\) axis till the first horizontal line with some negative \(y\) value, the field lines in between are southeast facing. In between this horizontal line and another horizontal line with a higher negative \(y\) value, the field lines are northeast facing.
8.1.4.16.
Answer.
The \(x\) and \(y\) axes are uncalibrated. The field lines run almost parallel to the \(x\) axis. Above the axis the field lines are slightly facing north east. Below the \(x\) axis the lines are directed facing southeast.
8.1.4.17.
Answer.
b
8.1.4.18.
Answer.
c
8.1.4.19.
Answer.
d
8.1.4.20.
Answer.
a
8.1.4.21.
Answer.
The \(x\) and \(y\) axes are uncalibrated, the field lines in the first quadrant are shown. The field lines very close to the \(y\) axis are almost north facing for higher values of \(y\) and almost east facing for lower values of \(y\text{.}\) With smaller values of \(x\text{,}\) the field lines, from left to right the lines first face northeast then east and southeast after for greater values of \(x\text{.}\)
A curve is drawn that starts at a point for some small value of \(x\) and a high value of \(y\text{.}\) The curve has a positive slope at first after reaching a peak it declines almost close to the \(x\) axis.
8.1.4.22.
Answer.
The \(x\) and \(y\) axes are uncalibrated, the field lines in the first quadrant are shown. Front left to right, a little away from the x axis the field lines are northeast facing that transition to north facing. Moving further right then again become northeast facing then transition to southeast facing, further right they become south facing then east facing. The pattern then repeats. Very close to the \(x\) axis the field lines are almost parallel to it.
A wave is drawn that starts at some y intercept above the origin. It has a high positive slope, it reaches peak when the field lines change from northeast facing to southeast facing, then it declines until the point the field lines are parallel to the \(x\) axis. The curve continues to form a second wave.
8.1.4.23.
Answer.
The \(x\) and \(y\) axes are uncalibrated, the field lines in the first quadrant are shown. There are two instances where the field lines are parallel to the \(x\) axis. From under the \(x\) axis to the first such line the field lines transition from almost north facing to northeast facing. Between the horizontal field line for a small \(y\) value and a greater \(y\) value the field lines are facing southeast. Above the line with a higher \(y\) value the field lines transition from northeast facing to north facing.
8.1.4.24.
Answer.
The \(x\) and \(y\) axes are uncalibrated, the field lines in the first quadrant are shown. In the top right and the centre the field lines are southeast facing, very close to the \(x\) and \(y\) axis the field lines are almost parallel to the \(x\) axis. A curve is drawn that starts from a \(y\) intercept and decreases along the slope lines coming close to the \(x\) axis.
8.1.4.25.
Answer.
\begin{align*}
x_i \amp \quad \amp \quad \amp y_i\\
0.00 \amp \quad \amp \quad \amp 1.0000 \\
0.25 \amp \quad \amp \quad \amp 1.5000 \\
0.50 \amp \quad \amp \quad \amp 2.3125 \\
0.75 \amp \quad \amp \quad \amp 3.5938\\
1.00 \amp \quad \amp \quad \amp 5.5781
\end{align*}
8.1.4.26.
Answer.
\begin{align*}
x_i \amp \quad \amp \quad \amp y_i \\
0.0 \amp \quad \amp \quad \amp 1.0000 \\
0.1 \amp \quad \amp \quad \amp 1.0000 \\
0.2 \amp \quad \amp \quad \amp 1.0037 \\
0.3 \amp \quad \amp \quad \amp 1.0110 \\
0.4 \amp \quad \amp \quad \amp 1.0219 \\
0.5 \amp \quad \amp \quad \amp 1.0363
\end{align*}
8.1.4.27.
Answer.
\begin{align*}
x_i \amp \quad \amp \quad \amp y_i \\
0.0 \amp \quad \amp \quad \amp 2.0000 \\
0.2 \amp \quad \amp \quad \amp 2.4000 \\
0.4 \amp \quad \amp \quad \amp 2.9197 \\
0.6 \amp \quad \amp \quad \amp 3.5816 \\
0.8 \amp \quad \amp \quad \amp 4.4108 \\
1.0 \amp \quad \amp \quad \amp 5.4364
\end{align*}
8.1.4.28.
Answer.
\begin{align*}
x_i \amp \quad \amp \quad \amp y_i \\
0.0 \amp \quad \amp \quad \amp 0.0000 \\
0.5 \amp \quad \amp \quad \amp 0.5000 \\
1.0 \amp \quad \amp \quad \amp 1.8591 \\
1.5 \amp \quad \amp \quad \amp 10.5824 \\
2.0 \amp \quad \amp \quad \amp 88378.1190
\end{align*}
8.1.4.29.
Answer.
| \(x\) | \(0.0\) | \(0.2\) | \(0.4\) | \(0.6\) | \(0.8\) | \(1.0\) |
| \(y(x)\) | 1.0000 | 1.0204 | 1.0870 | 1.2195 | 1.4706 | 2.0000 |
| \(h = 0.2\) | 1.0000 | 1.0000 | 1.0400 | 1.1265 | 1.2788 | 1.5405 |
| \(h = 0.1\) | 1.0000 | 1.0100 | 1.0623 | 1.1687 | 1.3601 | 1.7129 |
8.1.4.30.
Answer.
| \(x\) | \(0.0\) | \(0.2\) | \(0.4\) | \(0.6\) | \(0.8\) | \(1.0\) |
| \(y(x)\) | 0.5000 | 0.5412 | 0.6806 | 0.9747 | 1.5551 | 2.7183 |
| \(h = 0.2\) | 0.5000 | 0.5000 | 0.5816 | 0.7686 | 1.1250 | 1.7885 |
| \(h = 0.1\) | 0.5000 | 0.5201 | 0.6282 | 0.8622 | 1.3132 | 2.1788 |
8.2 Separable Differential Equations
8.2.2 Exercises
Problems
8.2.2.1.
Answer.
Separable. \(\displaystyle \frac{1}{y^2-y}\,dy = dx\)
8.2.2.2.
Answer.
Not separable.
8.2.2.3.
Answer.
Not separable.
8.2.2.4.
Answer.
Separable. \(\displaystyle \frac{1}{\cos y - y}\,dy = (x^2+1)\,dx\)
8.2.2.5.
Answer.
\(\left\{ \displaystyle y = \frac{1 + Ce^{2x}}{1 - Ce^{2x}}, y = -1\right\}\)
8.2.2.6.
Answer.
\(y = 2 + Ce^x\)
8.2.2.7.
Answer.
\(y = Cx^4\)
8.2.2.8.
Answer.
\(y^2 - 4x^2 = C\)
8.2.2.9.
Answer.
\(\displaystyle (y-1)e^y = -e^{-x} - \frac{1}{3}e^{-3x} + C\)
8.2.2.10.
Answer.
\(\displaystyle (y-1)^2 = \ln(x^2+1) + C\)
8.2.2.11.
Answer.
\(\left\{ \arcsin{2y} - \arctan(x^2+1) = C, y = \pm \displaystyle \frac{1}{2} \right\}\)
8.2.2.12.
Answer.
\(\left\{ \displaystyle y = \frac{1}{C - \arctan x}, y = 0 \right\}\)
8.2.2.13.
Answer.
\(\sin y + \cos(x) = 2\)
8.2.2.14.
Answer.
\(-x^3 + 3y - y^3 = 2\)
8.2.2.15.
Answer.
\(\frac{1}{2}y^2 - \ln(1+x^2) = 8\)
8.2.2.16.
Answer.
\(y^2+2xe^x - 2e^x = 2\)
8.2.2.17.
Answer.
\(\displaystyle \frac{1}{2}y^2 - y = \frac{1}{2}\big ( (x^2+1)\ln(x^2+1) - (x^2 + 1)\big) + \frac{1}{2}\)
8.2.2.18.
Answer.
\(\sin(y^2)-(\arcsin x)^2 = -\frac{1}{2}\)
8.2.2.19.
Answer.
\(2\tan 2y = 2x + \sin 2x\)
8.2.2.20.
Answer.
\(x = exp \displaystyle \left( -\frac{\sqrt{1-y^2}}{y}\right)\)
8.3 First Order Linear Differential Equations
8.3.2 Exercises
Problems
8.3.2.1.
Answer.
\(y = \displaystyle \frac{3}{2} + Ce^{2x}\)
8.3.2.2.
Answer.
\(y = \displaystyle \frac{\ln \abs{x} + C}{x}\)
8.3.2.3.
Answer.
\(y = \displaystyle -\frac{1}{2x} + Cx\)
8.3.2.4.
Answer.
\(y = \displaystyle \frac{x^3}{7} - \frac{x}{5} + \frac{C}{x^4}\)
8.3.2.5.
Answer.
\(y = \sec x + C(\csc x)\)
8.3.2.6.
Answer.
\(y = \displaystyle \frac{1}{2} + Ce^{-x^2}\)
8.3.2.7.
Answer.
\(y = \displaystyle Ce^{3x}-(x+1)e^{2x}\)
8.3.2.8.
Answer.
\(y = sin(2x) - 2\cos(2x) + Ce^{-x}\)
8.3.2.9.
Answer.
\(y = (x^2+2)e^x\)
8.3.2.10.
Answer.
\(y = \displaystyle \frac{1}{4}x^2-\frac{1}{3}x+\frac{1}{2}+\frac{7}{12x^2}\)
8.3.2.11.
Answer.
\(y = \displaystyle 1 - \frac{2}{x} + \frac{2-e^{1-x}}{x^2}\)
8.3.2.12.
Answer.
\(y = \displaystyle 3e^{-2x}\)
8.3.2.13.
Answer.
\(y = \displaystyle \frac{x^2+1}{x+1}e^{-x}\)
8.3.2.14.
Answer.
\(y = \sin(x) - 3\cos(x)\)
8.3.2.15.
Answer.
\(y = \displaystyle \frac{(x-2)(x+1)}{x-1}\)
8.3.2.16.
Answer.
\(y = \displaystyle x^2\left(\arctan x - \frac{\pi}{4}\right)\)
8.3.2.17.
Answer.
Both; \(\displaystyle y = -5e^{x + \frac{1}{3}x^3}\)
8.3.2.18.
Answer.
separable; \(\displaystyle e^y = \sin(x) - x\cos(x) + 1\)
8.3.2.19.
Answer.
linear; \(\displaystyle y = \frac{x^3-3x-6}{3(x-1)}\)
8.3.2.20.
Answer.
separable; \(\displaystyle y = 1\)
8.3.2.21.
Answer.
The \(x\) and \(y\) axes are uncalibrated, the field lines in the first quadrant are shown. On the bottom right the field lines are facing northeast. On the top left the field lines transition from southeast facing to east facing moving downwards. A curve is shown that almost represents a straight line with a positive slope.
The solution will increase and begin to follow the line \(y=x-1\text{.}\)
\(y = x-1 + e^{-x}\)
8.3.2.22.
Answer.
The \(x\) and \(y\) axes are uncalibrated, the field lines in the first quadrant are shown. The lines in the top are southeast facing, for lower values of \(y\) from left to right the field lines are northeast facing then they transition to east facing. A downward sloping curve is shown on the field lines.
The solution will decrease and approach \(y=0\text{.}\)
\(\displaystyle y = \frac{2 + \ln(x+1)}{x+1}\)
8.4 Modeling with Differential Equations
8.4.3 Exercises
Problems
8.4.3.1.
Answer.
\(y = 10 + Ce^{-kx}\)
8.4.3.2.
Answer.
13.66 days
8.4.3.3.
Answer.
4.43 days
8.4.3.4.
Answer.
13,304.65 years old
8.4.3.5.
Answer.
\(x = \begin{cases}\displaystyle\frac{ab(1 - e^{(a-b)kt})}{b-ae^{(a-b)kt}} \amp \text{ if } a \neq b\\ \displaystyle \frac{a^2kt}{1+akt} \amp \text{ if } a = b \end{cases}\)
8.4.3.6.
Answer.
24.57 minutes
8.4.3.7.
Answer.
\(\displaystyle y = 60 - 3.69858e^{-\frac{1}{4}t} + 43.69858e^{-0.0390169 t}\)
8.4.3.8.
Answer.
0.06767 g/gal
8.4.3.9.
Answer.
\(y = 8(1-e^{-\frac{1}{2}t})\) g/cm\(^2\)
8.4.3.10.
Answer.
\(y = \displaystyle 20 - \frac{10}{17}\left(4\cos(2t)- \sin(2t)\right) - \frac{300}{17}e^{-\frac{1}{2}t}\) g
8.4.3.11.
Answer.
11.00075 g
8.4.3.12.
Answer.
pond 1: 50.4853 grams per million gallons
pond 2: 32.8649 grams per million gallons
9 Curves in the Plane
9.1 Conic Sections
9.1.4 Exercises
Terms and Concepts
9.1.4.6.
Answer.
line
Problems
9.1.4.19.
Answer.
\(\frac{(x+1)^2}{9}+\frac{(y-2)^2}{4}=1\text{;}\) foci at \((-1\pm\sqrt{5},2)\text{;}\) \(e=\sqrt{5}/3\)
9.1.4.20.
Answer.
\(\frac{(x-1)^2}{1/4}+\frac{y^2}{9}=1\text{;}\) foci at \((1,\pm \sqrt{8.75})\text{;}\) \(e=\sqrt{8.75}/3\approx 0.99\)
9.1.4.29.
Answer.
\(x^2-\frac{y^2}{3}=1\)
9.1.4.30.
Answer.
\(y^2-\frac{x^2}{24}=1\)
9.1.4.31.
Answer.
\(\frac{(y-3)^2}{4}-\frac{(x-1)^2}{9}=1\)
9.1.4.32.
Answer.
\(\frac{(x-1)^2}{9}-\frac{(y-3)^2}{4}=1\)
9.1.4.45.
Answer.
The sound originated from a point approximately 31m to the right of \(B\) and 1390m above or below it. (Since the three points are collinear, we cannot distinguish whether the sound originated above/below the line containing the points.)
9.2 Parametric Equations
9.2.4 Exercises
Terms and Concepts
9.2.4.1.
Answer.
\(\text{True}\)
9.2.4.2.
Answer.
\({\text{orientation}}\)
9.2.4.3.
Answer.
\({\text{rectangular}}\)
Problems
9.2.4.5.
Answer.
The sketch for this exercise is a curve that lies mostly in the fourth quadrant. It resembles part of a slingshot orbit for a comet passing around the sun: the curve passes through the origin from below, turns quickly in the second quadrant, crossing the \(y\) axis at \((0,1)\text{,}\) and then the \(x\) axis at \((2,0)\text{,}\) where it returns to the fourth quadrant.
9.2.4.6.
Answer.
The curve for this exercise is the vertical line \(x=1\text{.}\) An arrow on the line indicates that the direction of travel is up.
9.2.4.7.
Answer.
The horizontal line \(y=2\text{.}\) On the line there are two arrows pointing in opposite directions. These indicate that the direction of travel is to the left when \(t\lt 0\text{,}\) and to the right when \(t\gt 0\text{.}\)
9.2.4.8.
Answer.
The curve begins to the left of the \(y\) axis, and crosses near \((0,4)\text{.}\) It passes through the first quadrant to the point \((3,2)\text{;}\) it then bends downward and makes a teardrop-shaped loop before passing through \((3,2)\) a second time, and then continuing up and to the right, through the first quadrant.
9.2.4.9.
Answer.
A curve resembling a check mark, with a cusp at the origin. Direction of travel is from the second quadrant toward the cusp, and then up from the cusp to a \(y\) intercept at \((0,4)\text{,}\) and then into the first quadrant.
9.2.4.10.
Answer.
A curve resembling a sine wave with a period that gets longer for large values of \(x\text{.}\) The direction of travel is that of decreasing \(x\) value, with the \(y\) value oscillating.
9.2.4.11.
Answer.
The curve is an ellipse, centered at the origin, with counter-clockwise direction of travel.
9.2.4.12.
Answer.
An ellipse with center \((2,3)\) and counter-clockwise direction of travel.
9.2.4.13.
Answer.
The curve resembles a parabola, with vertex at \((0,-1)\text{.}\) The direction of travel is from right to left.
9.2.4.14.
Answer.
A figure-eight curve, centered at the origin. The orientation is counter-clockwise in the fourth and first quadrants; once the curve passes through the origin (a point of self-intersection) this direction becomes clockwise it the second and third quadrants.
9.2.4.15.
Answer.
The curve resembles one branch of a hyperbola, opening to the right, with a vertex at \((2,0)\text{.}\) The direction of travel is that of increasing \(y\) value.
9.2.4.16.
Answer.
The curve resembles one branch of a hyperbola, opening to the right, with a vertex at \((1,0)\text{.}\) The direction of travel is that of increasing \(y\) value.
9.2.4.17.
Answer.
A flower-shaped curve, with 7 “petals”. Each petal is an arc that loops around and intersects itself before continuing to the next arc.
9.2.4.18.
Answer.
A curve that spirals around the origin, with several self-intersecting loops. This curve has 9 arcs and 9 loops. It is similar to the curve in the previous exercise, except that this time, the arcs bend inward toward the origin, rather than outward.
9.2.4.19.
9.2.4.19.a
Answer.
Traces the parabola \(y=x^2\text{,}\) moves from left to right.
9.2.4.19.b
Answer.
Traces the parabola \(y=x^2\text{,}\) but only from \(-1\leq x\leq 1\text{;}\) traces this portion back and forth infinitely.
9.2.4.19.c
Answer.
Traces the parabola \(y=x^2\text{,}\) but only for \(0\lt x\text{.}\) Moves left to right.
9.2.4.19.d
Answer.
Traces the parabola \(y=x^2\text{,}\) moves from right to left.
9.2.4.20.
9.2.4.20.a
Answer.
Traces a circle of radius 1 counterclockwise once.
9.2.4.20.b
Answer.
Traces a circle of radius 1 counterclockwise over 6 times.
9.2.4.20.c
Answer.
Traces a circle of radius 1 clockwise infinite times.
9.2.4.20.d
Answer.
Traces an arc of a circle of radius 1, from an angle of -1 radians to 1 radian, twice.
9.2.4.21.
Answer.
\(3x+2y = 17\)
9.2.4.25.
Answer.
\(y-2x = 3\)
9.2.4.30.
Answer.
\(x = 1-2y^{2}\)
9.2.4.35.
Answer 1.
\(\frac{t+11}{6}\)
Answer 2.
\(\frac{t^{2}-97}{12}\)
Answer 3.
\(\left(2,-8\right)\)
Answer 4.
\(6x-11\)
Answer 5.
\(1\)
9.2.4.36.
Answer 1.
\(\ln\mathopen{}\left(t\right)\)
Answer 2.
\(t\)
Answer 3.
\(\left(0,1\right)\)
Answer 4.
\(e^{x}\)
Answer 5.
\(1\)
9.2.4.37.
Answer 1.
\(\cos^{-1}\mathopen{}\left(t\right)\)
Answer 2.
\(\sqrt{1-t^{2}}\)
Answer 3.
\(\left(0,0\right)\)
Answer 4.
\(\cos\mathopen{}\left(x\right)\)
Answer 5.
\(1\)
9.2.4.39.
Answer 1.
\(-1, 1\)
Answer 2.
\(\left(3,-2\right)\)
9.2.4.44.
Answer 1.
\(2\)
Answer 2.
\(\left(-4,-8\right)\)
9.2.4.46.
Answer 1.
\(0\)
Answer 2.
\(\left(1,0\right)\)
9.2.4.50.
Answer.
\(2\cos\mathopen{}\left(t\right);\,-2\sin\mathopen{}\left(t\right)\)
9.2.4.51.
Answer.
\(3\cos\mathopen{}\left(2\pi t\right)+1;\,3\sin\mathopen{}\left(2\pi t\right)+1\)
9.2.4.52.
Answer.
\(3\cos\mathopen{}\left(2\pi t\right)+1;\,3\sin\mathopen{}\left(2\pi t\right)+1\)
9.3 Calculus and Parametric Equations
9.3.4 Exercises
Terms and Concepts
9.3.4.1.
Answer.
\(\text{False}\)
9.3.4.3.
Answer.
\(\text{False}\)
9.3.4.4.
Answer.
\(\text{True}\)
Problems
9.3.4.15.
Answer 1.
\(-0.5\)
Answer 2.
\(\left(0.75,-0.25\right)\)
9.3.4.18.
Answer 1.
\(\frac{\pi }{4}, \frac{3\pi }{4}, \frac{5\pi }{4}, \frac{7\pi }{4}\)
Answer 2.
\(\left(\frac{\sqrt{2}}{2},1\right), \left(\frac{-\sqrt{2}}{2},-1\right), \left(\frac{-\sqrt{2}}{2},1\right), \left(\frac{\sqrt{2}}{2},-1\right)\)
9.3.4.21.
Answer 1.
\(0\)
Answer 2.
\(0\)
9.3.4.22.
Answer 1.
\(2\)
Answer 2.
\(1\)
9.3.4.27.
Answer 1.
\(-\frac{4}{\left(2t-1\right)^{3}}\)
Answer 2.
\(\left(-\infty ,0.5\right]\)
Answer 3.
\(\left[0.5,\infty \right)\)
9.3.4.30.
Answer 1.
\(\frac{2\mathopen{}\left(\sin\mathopen{}\left(t\right)\mathopen{}\left(-2\right)\sin\mathopen{}\left(2t\right)-\cos\mathopen{}\left(2t\right)\cos\mathopen{}\left(t\right)\right)}{\sin^{3}\mathopen{}\left(t\right)}\)
Answer 2.
\(\left[\frac{\pi }{2}, \pi \right], \left[\frac{3\pi }{2}, 2\pi \right]\)
Answer 3.
\(\left[0, \frac{\pi }{2}\right], \left[\pi , \frac{3\pi }{2}\right]\)
9.3.4.33.
Answer.
\(6\pi \)
9.3.4.34.
Answer 1.
\(\sqrt{101}\mathopen{}\left(e^{\frac{\pi }{5}}-1\right)\)
Answer 2.
\(\sqrt{101}\mathopen{}\left(e^{\frac{2\pi }{5}}-e^{\frac{\pi }{5}}\right)\)
9.3.4.35.
Answer.
\(2\sqrt{34}\)
9.4 Introduction to Polar Coordinates
9.4.4 Exercises
Terms and Concepts
9.4.4.1.
Answer.
Answers will vary.
9.4.4.2.
Answer.
\(\text{False}\)
9.4.4.3.
Answer.
\(\text{True}\)
9.4.4.4.
Answer.
\(\text{False}\)
Problems
9.4.4.5.
Answer.
On a polar grid, four points are plotted. The point \(A\) is at the intersection of the initial ray and the circle of radius 2. Points \(B\) and \(D\) are both on the circle of radius 1. The point \(B\) is on the same line as the initial ray, but in the opposite direction. The point \(D\) lies above the initial ray, making an angle of \(\pi/4\text{.}\) Finally, the point \(C\) is at the bottom of the circle of radius \(2\text{.}\)
9.4.4.6.
Answer.
On a polar grid, four points are plotted. Points \(A\) and \(B\) are both on the same line as the initial ray, but to the left of the origin \(O\text{,}\) with \(A\) on the circle of radius 2, and \(B\) on the circle of radius 1. The point \(C\) is on the circle of radius 1, and makes an angle slightly greater than a right angle with the initial ray, placing it above and just to the left of the origin \(O\text{.}\) The point \(D\) lies almost immediately below the point \(C\text{;}\) the circle of radius \(1/2\) is not marked as part of the grid.
9.4.4.7.
Answer.
\(A=P(2.5,\pi/4)\) and \(P(-2.5,5\pi/4)\text{;}\)
\(B=P(-1,5\pi/6)\) and \(P(1,11\pi/6)\text{;}\)
\(C=P(3,4\pi/3)\) and \(P(-3,\pi/3)\text{;}\)
\(D=P(1.5,2\pi/3)\) and \(P(-1.5,5\pi/3)\text{;}\)
9.4.4.8.
Answer 1.
\(\left(2, 0.523599\right), \left(-2, -2.61799\right)\)
Answer 2.
\(\left(1, -1.0472\right), \left(-1, 2.0944\right)\)
Answer 3.
\(\left(2, 2.35619\right), \left(-2, -0.785398\right)\)
Answer 4.
\(\left(2.5, 3.14159\right), \left(2.5, -3.14159\right)\)
9.4.4.9.
Answer 1.
\(\left(\sqrt{2},\sqrt{2}\right)\)
Answer 2.
\(\left(\sqrt{2},-\sqrt{2}\right)\)
Answer 3.
\(\left(\sqrt{5},\tan^{-1}\mathopen{}\left(\frac{-1}{2}\right)\right)\)
Answer 4.
\(\left(\sqrt{5},\pi +\tan^{-1}\mathopen{}\left(\frac{-1}{2}\right)\right)\)
9.4.4.10.
Answer 1.
\(\left(-3,0\right)\)
Answer 2.
\(\left(\frac{-1}{2},\frac{\sqrt{3}}{2}\right)\)
Answer 3.
\(\left(4,\frac{\pi }{2}\right)\)
Answer 4.
\(\left(2,\frac{-\pi }{3}\right)\)
9.4.4.11.
Answer.
An arc of the circle \(r=2\) is shown, for \(0\leq \theta\leq \pi/2\text{.}\) This is the quarter of a circle of radius 2, centered at the origin, that lies in the first quadrant.
9.4.4.12.
Answer.
A line segment through the origin is shown. The segment makes an angle of \(\pi/6\) with the positive \(x\) axis, and it extends a distance of 2 units into the first quadrant, and one unit into the third quadrant.
9.4.4.13.
Answer.
The curve is a cardioid that is symmetric about the \(x\) axis. The cusp is at the origin, and the other \(x\) intercept is at \((-2,0)\text{.}\) (It is in the opposite direction of the example in the gallery of polar curves.)
9.4.4.14.
Answer.
The curve is a convex limaçon. This is the fourth type of limaçon in the gallery of polar curves. In this case, the limaçon is symmetric about the \(y\) axis, with the flattened part of the curve at the bottom.
9.4.4.15.
Answer.
The curve is a convex limaçon. This is the fourth type of limaçon in the gallery of polar curves. In this case, the limaçon is symmetric about the \(y\) axis, with the flattened part of the curve at the top.
9.4.4.16.
Answer.
The curve is a limaçon with an inner loop. It is symmetric about the \(y\) axis. The inner loop lies below the \(x\) axis, with \(y\) intercepts at \(y=0\) and \(y=-1\text{.}\) The outer loop has its other \(y\) intercept at \(y=-3\text{.}\)
9.4.4.17.
Answer.
The curve is a limaçon with an inner loop. It is symmetric about the \(y\) axis. The inner loop lies above the \(x\) axis, with \(y\) intercepts at \(y=0\) and \(y=1\text{.}\) The outer loop has its other \(y\) intercept at \(y=3\text{.}\)
9.4.4.18.
Answer.
The curve is a rose curve with four loops that all pass through the origin. The loops are symmetric about the two coordinate axes, with their second intercepts at \((\pm 1,0)\) and \((0,\pm 1)\text{.}\)
9.4.4.19.
Answer.
A rose curve with three loops that all pass through the origin. One loop is along the negative \(y\) axis, with a \(y\) intercept at \((-1,0)\text{.}\) The other two loops lie in the first and second quadrants.
9.4.4.20.
Answer.
The curve is a limaçon with an inner loop, symmetric about the \(x\) axis, but it is shifted horizontally, to the left, relative to the example in the gallery of polar curves.
The point of self-intersection is at \((-1/2, 0)\text{.}\) The other end of the inner loop is at the origin, and the far end of the outer loop is at the point \((1,0)\text{.}\)
9.4.4.21.
Answer.
This is a more complicated curve. It passes several times through the origin, and has eight other points of self-intersection. The largest loops in the curve are similar to cardioids; there are four of these passing through the origin, with a second intercept at one of the four points \((\pm 1, 0)\text{,}\) \((0,\pm 1)\text{.}\) As these loops intersect each other, they create four other loops of intermediate size, and four smaller loops in the center.
9.4.4.22.
Answer.
The curve is a counter-clockwise spiral that begins at the origin. It makes two full revolutions, and ends at the point \((2\pi, 0)\text{.}\)
9.4.4.23.
Answer.
A circle of radius \(3/2\) with its center at \((0,3/2)\text{.}\) It passes through the origin and the point \((0,3)\text{.}\)
9.4.4.24.
Answer.
The curve is a semi-circle in the first quadrant. Its endpoints are \((0,0)\) and \((2,0)\text{,}\) making the center \((1,0)\) and radius 1.
9.4.4.25.
Answer.
The curve is a four-leafed rose that lies within the circle \(r=1/2\text{.}\) One leaf lies in each of the four quadrants.
9.4.4.26.
Answer.
The curve for this exercise is a fairly strange shape. It is symmetric about the \(x\) axis. There is a large, outer loop that looks like a leaf or a raindrop. It has a cusp at \((-7,0)\text{,}\) and also passes through the origin. There is a smaller, inner loop that looks almost like a circle. It passes through the origin and the point \((-3,0)\text{.}\)
9.4.4.27.
Answer.
The curve is a straight line with \(x\) intercept at \((-3,0)\) and \(y\) intercept \((0,3/5)\text{.}\)
9.4.4.28.
Answer.
The curve is a straight line with \(x\) intercept at \((-2/3,0)\) and \(y\) intercept \((0,1)\text{.}\)
9.4.4.29.
Answer.
The curve is the vertical line \(x=3\text{.}\)
9.4.4.30.
Answer.
The curve is the horizontal line \(y=4\text{.}\)
9.4.4.31.
Answer.
\(\left(x-3\right)^{2}+y^{2} = 9\)
9.4.4.32.
Answer.
\(x^{2}+\left(y+2\right)^{2} = 4\)
9.4.4.33.
Answer.
\(\left(x-0.5\right)^{2}+\left(y-0.5\right)^{2} = 0.5\)
9.4.4.34.
Answer.
\(y = 0.4x+1.4\)
9.4.4.35.
Answer.
\(x = 3\)
9.4.4.36.
Answer.
\(y = 4\)
9.4.4.38.
Answer.
\(y^4+x^2y^2-x^2=0\)
9.4.4.39.
Answer.
\(x^{2}+y^{2} = 4\)
9.4.4.40.
Answer.
\(y = \frac{x}{1.73205}\)
9.4.4.41.
Answer.
\(\theta = \frac{\pi }{4}\)
9.4.4.42.
Answer.
\(r = \frac{7}{\sin\mathopen{}\left(\theta\right)-4\cos\mathopen{}\left(\theta\right)}\)
9.4.4.43.
Answer.
\(r = 5\sec\mathopen{}\left(\theta\right)\)
9.4.4.44.
Answer.
\(r = 5\csc\mathopen{}\left(\theta\right)\)
9.4.4.45.
Answer.
\(r = \frac{\cos\mathopen{}\left(\theta\right)}{\sin^{2}\mathopen{}\left(\theta\right)}\)
9.4.4.47.
Answer.
\(r = \sqrt{7}\)
9.4.4.49.
Answer.
\(P\left(\frac{\sqrt{3}}{2},\frac{\pi }{6}\right), P\left(0,\frac{\pi }{2}\right), P\left(\frac{-\sqrt{3}}{2},\frac{5\pi }{6}\right)\)
9.4.4.51.
Answer.
\(P\left(0,0\right), P\left(\sqrt{2},\frac{\pi }{4}\right)\)
9.4.4.54.
Answer.
\(P\left(\frac{3}{2},\frac{\pi }{3}\right), P\left(\frac{3}{2},\frac{-\pi }{3}\right), P\left(0,\pi \right)\)
9.5 Calculus and Polar Functions
9.5.5 Exercises
Problems
9.5.5.3.
Answer 1.
\(-\cot\mathopen{}\left(\theta\right)\)
Answer 2.
\(y = -\left(x-\frac{\sqrt{2}}{2}\right)+\frac{\sqrt{2}}{2}\)
Answer 3.
\(y = x\)
9.5.5.4.
Answer 1.
\(0.5\mathopen{}\left(\tan\mathopen{}\left(\theta\right)-\cot\mathopen{}\left(\theta\right)\right)\)
Answer 2.
\(y = \frac{1}{2}\)
Answer 3.
\(x = \frac{1}{2}\)
9.5.5.7.
Answer 1.
\(\frac{\theta\cos\mathopen{}\left(\theta\right)+\sin\mathopen{}\left(\theta\right)}{\cos\mathopen{}\left(\theta\right)-\theta\sin\mathopen{}\left(\theta\right)}\)
Answer 2.
\(y = \frac{-2}{\pi }x+\frac{\pi }{2}\)
Answer 3.
\(y = \frac{\pi }{2}x+\frac{\pi }{2}\)
9.5.5.8.
Answer 1.
\(\frac{\cos\mathopen{}\left(\theta\right)\cos\mathopen{}\left(3\theta\right)-3\sin\mathopen{}\left(\theta\right)\sin\mathopen{}\left(3\theta\right)}{-\cos\mathopen{}\left(3\theta\right)\sin\mathopen{}\left(\theta\right)-3\cos\mathopen{}\left(\theta\right)\sin\mathopen{}\left(3\theta\right)}\)
Answer 2.
\(y = \frac{x}{\sqrt{3}}\)
Answer 3.
\(y = -\sqrt{3}x\)
9.5.5.9.
Answer 1.
\(\frac{4\sin\mathopen{}\left(\theta\right)\cos\mathopen{}\left(4\theta\right)+\sin\mathopen{}\left(4\theta\right)\cos\mathopen{}\left(\theta\right)}{4\cos\mathopen{}\left(\theta\right)\cos\mathopen{}\left(4\theta\right)-\sin\mathopen{}\left(\theta\right)\sin\mathopen{}\left(4\theta\right)}\)
Answer 2.
\(y = 5\sqrt{3}\mathopen{}\left(x+\frac{\sqrt{3}}{4}\right)-\frac{3}{4}\)
Answer 3.
\(y = \frac{-1}{5\sqrt{3}}\mathopen{}\left(x+\frac{\sqrt{3}}{4}\right)-\frac{3}{4}\)
9.5.5.14.
Answer 1.
\(\frac{\pi }{3}, \pi , \frac{5\pi }{3}\)
Answer 2.
\(0, \frac{2\pi }{3}, \frac{4\pi }{3}\)
9.5.5.19.
Answer.
\(\frac{\pi }{12}\)
9.5.5.20.
Answer.
area = \(\pi/(4n)\)
9.5.5.21.
Answer.
\(\frac{3\pi }{2}\)
9.5.5.23.
Answer.
\(2\pi +\frac{3\cdot 1.73205}{2}\)
9.5.5.24.
Answer.
\(\pi +3\cdot 1.73205\)
9.5.5.25.
Answer.
\(1\)
9.5.5.26.
Answer.
\(\frac{1}{32}\mathopen{}\left(4\pi -3\cdot 1.73205\right)\)
9.5.5.29.
Answer.
\(4\pi \)
9.5.5.30.
Answer.
\(4\pi \)
9.5.5.31.
Answer.
\(\sqrt{2}\pi\)
9.5.5.32.
Answer.
\(8\)
9.5.5.33.
Answer.
\(2.2592\hbox{ or }2.22748\)
9.5.5.40.
Answer.
\(SA = 9\pi\)
III Math 2570: Calculus III
10 Sequences and Series
10.1 Sequences
Exercises
Terms and Concepts
10.1.1.
Answer.
Answers will vary.
10.1.2.
Answer.
natural
10.1.3.
Answer.
Answers will vary.
10.1.4.
Answer.
Answers will vary.
Problems
10.1.5.
Answer.
\(2,\frac{8}{3},\frac{8}{3},\frac{32}{15},\frac{64}{45}\)
10.1.6.
Answer.
\(-\frac{3}{2},\frac{9}{4},-\frac{27}{8},\frac{81}{16},
-\frac{243}{32}\)
10.1.7.
Answer.
\(-\frac{1}{3},-2,-\frac{81}{5},-\frac{512}{3},-\frac{15625}{7}\)
10.1.8.
Answer.
\(1, 1, 2, 3, 5\)
10.1.9.
Answer.
\(a_n = 3n+1\)
10.1.10.
Answer.
\(a_n = (-1)^{n+1}\frac{3}{2^{n-1}}\)
10.1.11.
Answer.
\(a_n = 10\cdot 2^{n-1}\)
10.1.12.
Answer.
\(a_n = 1/(n-1)!\)
10.1.13.
Answer.
\(1/7\)
10.1.14.
Answer.
\(3e^2-1\)
10.1.15.
Answer.
\(0\)
10.1.16.
Answer.
\(e^4\)
10.1.17.
Answer.
diverges
10.1.18.
Answer.
converges to \(4/3\)
10.1.19.
Answer.
converges to \(0\)
10.1.20.
Answer.
converges to \(0\)
10.1.21.
Answer.
diverges
10.1.22.
Answer.
converges to 3
10.1.23.
Answer.
converges to \(e\)
10.1.24.
Answer.
converges to 5
10.1.25.
Answer.
converges to 0
10.1.26.
Answer.
diverges
10.1.27.
Answer.
converges to 2
10.1.28.
Answer.
converges to 0
10.1.29.
Answer.
bounded
10.1.30.
Answer.
neither bounded above or below
10.1.31.
Answer.
bounded
10.1.32.
Answer.
bounded below
10.1.33.
Answer.
neither bounded above or below
10.1.34.
Answer.
bounded above
10.1.35.
Answer.
monotonically increasing
10.1.36.
Answer.
monotonically increasing for \(n\geq 3\)
10.1.37.
Answer.
never monotonic
10.1.38.
Answer.
monotonically decreasing for \(n\geq 3\)
10.1.40.
10.1.40.b
Answer.
\(a_n = 1/3^n\) and \(b_n = 1/2^n\)
10.2 Infinite Series
10.2.4 Exercises
Terms and Concepts
10.2.4.1.
Answer.
Answers will vary.
10.2.4.2.
Answer.
Answers will vary.
10.2.4.4.
Answer.
Answers will vary.
10.2.4.5.
Answer.
F
10.2.4.6.
Answer.
F
10.3 Integral and Comparison Tests
10.3.4 Exercises
Terms and Concepts
10.3.4.1.
Answer.
continuous, positive and decreasing
10.3.4.2.
Answer.
F
Problems
10.3.4.5.
Answer.
Converges
10.3.4.6.
Answer.
Converges
10.3.4.7.
Answer.
Diverges
10.3.4.8.
Answer.
Diverges
10.3.4.9.
Answer.
Converges
10.3.4.10.
Answer.
Converges
10.3.4.11.
Answer.
Converges
10.3.4.12.
Answer.
Converges
10.4 Ratio and Root Tests
10.4.3 Exercises
Terms and Concepts
10.4.3.1.
Answer.
algebraic, or polynomial.
10.4.3.2.
Answer.
factorial and/or exponential
10.4.3.3.
Answer.
Integral Test, Limit Comparison Test, and Root Test
10.4.3.4.
Answer.
raised to a power
Problems
10.4.3.5.
Answer.
Converges
10.4.3.6.
Answer.
Diverges
10.4.3.7.
Answer.
Converges
10.4.3.8.
Answer.
Converges
10.4.3.9.
Answer.
The Ratio Test is inconclusive; the \(p\)-Series Test states it diverges.
10.4.3.10.
Answer.
The Ratio Test is inconclusive; the Direct Comparison Test with \(1/n^3\) shows it converges.
10.4.3.11.
Answer.
Converges
10.4.3.12.
Answer.
Converges
10.4.3.13.
Answer.
Converges; note the summation can be rewritten as \(\ds\infser \frac{2^nn!}{3^nn!}\text{,}\) from which the Ratio Test or Geometric Series Test can be applied.
10.4.3.14.
Answer.
Converges; rewrite the summation as \(\ds\infser \frac{n!}{5^nn!}\) then apply the Ratio Test or Geometric Series Test.
10.4.3.15.
Answer.
Converges
10.4.3.16.
Answer.
Converges
10.4.3.17.
Answer.
Converges
10.4.3.18.
Answer.
Converges
10.4.3.19.
Answer.
Diverges
10.4.3.20.
Answer.
Converges
10.4.3.21.
Answer.
Diverges. The Root Test is inconclusive, but the \(n\)th-Term Test shows divergence. (The terms of the sequence approach \(e^{-2}\text{,}\) not 0, as \(n\to\infty\text{.}\))
10.4.3.22.
Answer.
Converges
10.4.3.23.
Answer.
Converges
10.4.3.24.
Answer.
Converges
10.5 Alternating Series and Absolute Convergence
Exercises
Terms and Concepts
10.5.2.
Answer.
postive, decreasing, 0
10.5.3.
Answer.
Many examples exist; one common example is \(a_n = (-1)^n/n\text{.}\)
10.5.4.
Answer.
conditionally
11 Vectors
11.1 Introduction to Cartesian Coordinates in Space
11.1.7 Exercises
Terms and Concepts
11.1.7.2.
Answer 1.
\({\text{line}}\)
Answer 2.
\({\text{plane}}\)
11.1.7.4.
Answer.
\(\text{Hyperbolic Paraboloid}\)
Problems
11.1.7.7.
Answer 1.
\(\sqrt{6}\)
Answer 2.
\(\sqrt{17}\)
Answer 3.
\(\sqrt{11}\)
Answer 4.
\(\text{do}\)
11.1.7.9.
Answer 1.
\(\left(4,-1,0\right)\)
Answer 2.
\(3\)
11.1.7.10.
Answer 1.
\(\left(-2,1,2\right)\)
Answer 2.
\(\sqrt{5}\)
11.1.7.15.
Answer.
11.1.7.16.
Answer.
11.1.7.17.
Answer.
11.1.7.18.
Answer.
11.1.7.19.
Answer.
\(x^{2}+z^{2} = \left(\frac{1}{1+y^{2}}\right)^{2}\)
11.1.7.20.
Answer.
\(y^{2}+z^{2} = x^{4}\)
11.1.7.21.
Answer.
\(x^{2}+y^{2} = z\)
11.1.7.22.
Answer.
\(x^{2}+y^{2} = \frac{1}{z^{2}}\)
11.1.7.23.
Answer.
(a)\(\ds x=y^2+\frac{z^2}{9}\)
11.1.7.24.
Answer.
(b) \(x^2-y^2+z^2=0\)
11.1.7.25.
Answer.
(b) \(\ds x^2+\frac{y^2}9+\frac{z^2}4=1\)
11.1.7.26.
Answer.
(a) \(y^2-x^2-z^2=1\)
11.1.7.27.
Answer.
11.1.7.28.
Answer.
11.1.7.29.
Answer.
11.1.7.30.
Answer.
11.1.7.31.
Answer.
11.1.7.32.
Answer.
11.2 An Introduction to Vectors
Exercises
Terms and Concepts
11.2.4.
Answer.
Direction
Problems
11.2.7.
Answer.
\(\left<1,6\right>\)
Answer.
\(\boldsymbol{i}+6\boldsymbol{j}\)
11.2.8.
Answer.
\(\left<4,-4\right>\)
Answer.
\(4\boldsymbol{i}-4\boldsymbol{j}\)
11.2.9.
Answer.
\(\left<6,-1,6\right>\)
Answer.
\(6\boldsymbol{i}-\boldsymbol{j}+6\boldsymbol{k}\)
11.2.10.
Answer.
\(\left<2,2,0\right>\)
Answer.
\(2\boldsymbol{i}+2\boldsymbol{j}\)
11.2.11.
11.2.11.a
Answer.
\(\vec u+\vec v = \la 2,-1\ra\text{;}\) \(\vec u -\vec v = \la0,-3\ra\text{;}\) \(2\vec u-3\vec v = \la -1,-7\ra\text{.}\)
11.2.11.c
Answer.
\(\vec x = \la 1/2,2\ra\text{.}\)
11.2.12.
11.2.12.a
Answer.
\(\vec u+\vec v = \la 3,2,1\ra\text{;}\) \(\vec u -\vec v = \la-1,0,-3\ra\text{;}\) \(\pi\vec u-\sqrt{2}\vec v = \la \pi-2\sqrt{2},\pi-\sqrt{2},-\pi-2\sqrt{2}\ra\text{.}\)
11.2.12.c
Answer.
\(\vec x = \la-1,0,-3\ra\text{.}\)
11.2.17.
Answer 1.
\(\sqrt{5}\)
Answer 2.
\(\sqrt{13}\)
Answer 3.
\(\sqrt{26}\)
Answer 4.
\(\sqrt{10}\)
11.2.18.
Answer 1.
\(\sqrt{17}\)
Answer 2.
\(\sqrt{3}\)
Answer 3.
\(\sqrt{14}\)
Answer 4.
\(\sqrt{26}\)
11.2.19.
Answer 1.
\(\sqrt{5}\)
Answer 2.
\(3\sqrt{5}\)
Answer 3.
\(2\sqrt{5}\)
Answer 4.
\(4\sqrt{5}\)
11.2.20.
Answer 1.
\(7\)
Answer 2.
\(35\)
Answer 3.
\(42\)
Answer 4.
\(28\)
11.2.22.
Answer.
\(\left<\frac{3}{\sqrt{58}},\frac{7}{\sqrt{58}}\right>\)
11.2.23.
Answer.
\(\left<0.6,0.8\right>\)
11.2.24.
Answer.
\(\left<\frac{1}{3},\frac{-2}{3},\frac{2}{3}\right>\)
11.2.25.
Answer.
\(\left<\frac{1}{\sqrt{3}},\frac{-1}{\sqrt{3}},\frac{1}{\sqrt{3}}\right>\)
11.2.26.
Answer.
\(\left<\cos\mathopen{}\left(\frac{50\pi }{180}\right),\sin\mathopen{}\left(\frac{50\pi }{180}\right)\right>\)
11.2.27.
Answer.
\(\left<\frac{-1}{2},\frac{\sqrt{3}}{2}\right>\)
11.3 The Dot Product
11.3.2 Exercises
Terms and Concepts
11.3.2.1.
Answer.
Scalar
Problems
11.3.2.5.
Answer.
\(-22\)
11.3.2.6.
Answer.
\(33\)
11.3.2.7.
Answer.
\(3\)
11.3.2.8.
Answer.
\(0\)
11.3.2.9.
Answer.
not defined
11.3.2.10.
Answer.
\(0\)
11.3.2.11.
Answer.
Answers will vary.
11.3.2.12.
Answer.
Answers will vary.
11.3.2.13.
Answer.
\(\cos^{-1}\mathopen{}\left(\frac{3}{\sqrt{10}}\right)\)
11.3.2.14.
Answer.
\(\cos^{-1}\mathopen{}\left(\frac{-1}{\sqrt{170}}\right)\)
11.3.2.15.
Answer.
\(\frac{\pi }{4}\)
11.3.2.16.
Answer.
\(\frac{\pi }{2}\)
11.3.2.17.
Answer 1.
\(\left<-7,4\right>\)
Answer 2.
\(\left<4,7\right>\)
11.3.2.18.
Answer 1.
\(\left<5,3\right>\)
Answer 2.
\(\left<-3,5\right>\)
11.3.2.19.
Answer 1.
\(\left<1,0,-1\right>\)
Answer 2.
\(\left<1,1,1\right>\)
11.3.2.20.
Answer 1.
\(\left<2,1,0\right>\)
Answer 2.
\(\left<1,-2,3\right>\)
11.3.2.21.
Answer.
\(\left<\frac{-5}{10},\frac{15}{10}\right>\)
11.3.2.22.
Answer.
\(\left<\frac{20}{10},\frac{60}{10}\right>\)
11.3.2.23.
Answer.
\(\left<\frac{-1}{2},\frac{-1}{2}\right>\)
11.3.2.24.
Answer.
\(\left<\frac{0}{13},\frac{0}{13}\right>\)
11.3.2.25.
Answer.
\(\left<\frac{14}{14},\frac{28}{14},\frac{42}{14}\right>\)
11.3.2.26.
Answer.
\(\left<\frac{12}{9},\frac{12}{9},\frac{6}{9}\right>\)
11.3.2.27.
Answer 1.
\(\left<\frac{-5}{10},\frac{15}{10}\right>\)
Answer 2.
\(\left<\frac{15}{10},\frac{5}{10}\right>\)
11.3.2.28.
Answer 1.
\(\left<\frac{20}{10},\frac{60}{10}\right>\)
Answer 2.
\(\left<\frac{30}{10},\frac{-10}{10}\right>\)
11.3.2.29.
Answer 1.
\(\left<\frac{-1}{2},\frac{-1}{2}\right>\)
Answer 2.
\(\left<\frac{-5}{2},\frac{5}{2}\right>\)
11.3.2.30.
Answer 1.
\(\left<\frac{0}{13},\frac{0}{13}\right>\)
Answer 2.
\(\left<\frac{-39}{13},\frac{26}{13}\right>\)
11.3.2.31.
Answer 1.
\(\left<\frac{14}{14},\frac{28}{14},\frac{42}{14}\right>\)
Answer 2.
\(\left<\frac{0}{14},\frac{42}{14},\frac{-28}{14}\right>\)
11.3.2.32.
Answer 1.
\(\left<\frac{12}{9},\frac{12}{9},\frac{6}{9}\right>\)
Answer 2.
\(\left<\frac{15}{9},\frac{-21}{9},\frac{12}{9}\right>\)
11.3.2.33.
Answer.
1.96lb
11.3.2.34.
Answer.
5lb
11.3.2.35.
Answer.
\(141.42\)ft–lb
11.3.2.36.
Answer.
\(196.96\)ft–lb
11.3.2.37.
Answer.
\(500\)ft–lb
11.3.2.39.
Answer.
\(500\)ft–lb
11.4 The Cross Product
11.4.3 Exercises
Terms and Concepts
11.4.3.1.
Answer.
vector
11.4.3.2.
Answer.
right hand rule
11.4.3.3.
Answer.
“Perpendicular” is one answer.
11.4.3.4.
Answer.
\(\text{True}\)
11.4.3.5.
Answer.
Torque
11.4.3.6.
Answer.
T
Problems
11.4.3.7.
Answer.
\(\left<12,-15,3\right>\)
11.4.3.8.
Answer.
\(\left<11,1,-17\right>\)
11.4.3.9.
Answer.
\(\left<-5,-31,27\right>\)
11.4.3.10.
Answer.
\(\left<47,-36,-44\right>\)
11.4.3.11.
Answer.
\(\left<0,-2,0\right>\)
11.4.3.12.
Answer.
\(\left<0,0,0\right>\)
11.4.3.13.
Answer.
\(\vec u\times \vec v = \langle 0,0,ad-bc\rangle\)
11.4.3.14.
Answer.
\(\boldsymbol{k}\)
11.4.3.15.
Answer.
\(-\boldsymbol{j}\)
11.4.3.16.
Answer.
\(\boldsymbol{i}\)
11.4.3.17.
Answer.
Answers will vary.
11.4.3.18.
Answer.
Answers will vary.
11.4.3.19.
Answer.
\(5\)
11.4.3.20.
Answer.
\(21\)
11.4.3.21.
Answer.
\(0\)
11.4.3.22.
Answer.
\(5\)
11.4.3.23.
Answer.
\(\sqrt{14}\)
11.4.3.24.
Answer.
\(\sqrt{230}\)
11.4.3.25.
Answer.
\(3\)
11.4.3.26.
Answer.
\(6\)
11.4.3.27.
Answer.
\(\frac{5\sqrt{2}}{2}\)
11.4.3.28.
Answer.
\(3\sqrt{30}\)
11.4.3.29.
Answer.
\(1\)
11.4.3.30.
Answer.
\(\frac{5}{2}\)
11.4.3.31.
Answer.
\(7\)
11.4.3.32.
Answer.
\(4\sqrt{14}\)
11.4.3.33.
Answer.
\(2\)
11.4.3.34.
Answer.
\(15\)
11.4.3.35.
Answer.
\(\left<0.408248,0.408248,-0.816497\right>\hbox{ or }\left<-0.408248,-0.408248,0.816497\right>\)
11.4.3.36.
Answer.
\(\left<-0.436436,0.218218,0.872872\right>\hbox{ or }\left<0.436436,-0.218218,-0.872872\right>\)
11.4.3.37.
Answer.
\(\left<0,1,0\right>\hbox{ or }\left<0,-1,0\right>\)
11.4.3.38.
Answer.
\(\left<\frac{2}{\sqrt{5}},\frac{1}{\sqrt{5}},0\right>\)
11.4.3.39.
Answer.
\(87.5\)ft–lb
11.4.3.40.
Answer.
\(43.75\sqrt{3}\approx 75.78\)ft–lb
11.4.3.41.
Answer.
\(200/3\approx 66.67\)ft–lb
11.4.3.42.
Answer.
\(11.58\)ft–lb
11.5 Lines
11.5.4 Exercises
Terms and Concepts
11.5.4.1.
Answer.
A point on the line and the direction of the line.
11.5.4.2.
Answer.
parallel
11.5.4.3.
Answer.
parallel, skew
11.5.4.4.
Answer.
Answers will vary
Problems
11.5.4.6.
Answer 1.
\(\left(6,1,7\right)+t\mathopen{}\left<-3,2,5\right>\)
Answer 2.
\(x = 6-3t, y = 1+2t, z = 7+5t\)
Answer 3.
\(\frac{x-6}{-3} = \frac{y-1}{2} = \frac{z-7}{5}\)
11.5.4.8.
Answer 1.
\(\left(1,-2,3\right)+t\mathopen{}\left<4,7,2\right>\)
Answer 2.
\(x = 1+4t, y = -2+7t, z = 3+2t\)
Answer 3.
\(\frac{x-1}{4} = \frac{y+2}{7} = \frac{z-3}{2}\)
11.5.4.10.
Answer 1.
\(\left(5,1,9\right)+t\mathopen{}\left<0,-1,0\right>\)
Answer 2.
\(x = 5, y = 1-t, z = 9\)
Answer 3.
\(\text{DNE}\)
11.5.4.11.
Answer 1.
\(\left(7,2,-1\right)+t\mathopen{}\left<1,-1,2\right>\)
Answer 2.
\(x = 7+t, y = 2-t, z = -1+2t\)
Answer 3.
\(x-7 = 2-y = \frac{z+1}{2}\)
11.5.4.12.
Answer 1.
\(\left(2,2,3\right)+t\mathopen{}\left<5,-1,-3\right>\)
Answer 2.
\(x = 2+5t, y = 2-t, z = 3-3t\)
Answer 3.
\(\frac{x-2}{5} = -\left(y-2\right) = \frac{-\left(z-3\right)}{3}\)
11.5.4.14.
Answer 1.
\(\left(-2,5\right)+t\mathopen{}\left<0,1\right>\)
Answer 2.
\(x = -2, y = 5+t\)
Answer 3.
\(\text{DNE}\)
11.5.4.15.
Answer.
\(\text{parallel}\)
11.5.4.16.
Answer.
\(\left(12,3,7\right)\)
11.5.4.18.
Answer.
\(\text{same}\)
11.5.4.19.
Answer.
\(\text{skew}\)
11.5.4.20.
Answer.
\(\text{parallel}\)
11.5.4.22.
Answer.
\(\text{skew}\)
11.5.4.23.
Answer.
\(\sqrt{41}/3\)
11.5.4.24.
Answer.
\(3\sqrt{2}\)
11.5.4.25.
Answer.
\(5\sqrt{2}/2\)
11.5.4.26.
Answer.
\(5\)
11.5.4.27.
Answer.
\(3/\sqrt{2}\)
11.5.4.28.
Answer.
\(2\)
11.6 Planes
11.6.2 Exercises
Terms and Concepts
11.6.2.1.
Answer.
A point in the plane and a normal vector (i.e., a direction orthogonal to the plane).
11.6.2.2.
Answer.
A normal vector is orthogonal to the plane.
Problems
11.6.2.3.
Answer.
Answers will vary.
11.6.2.4.
Answer.
\(\left(-2,9,0\right), \left(2,9,3\right)\)
11.6.2.5.
Answer.
Answers will vary.
11.6.2.6.
Answer.
\(\left(0,-2,6\right), \left(1,-2,6\right)\)
11.6.2.8.
Answer 1.
\(2\mathopen{}\left(y-3\right)+4\mathopen{}\left(z-5\right) = 0\)
Answer 2.
\(2y+4z = 26\)
11.6.2.10.
Answer 1.
\(-5\mathopen{}\left(x-5\right)+3\mathopen{}\left(y-3\right)+2\mathopen{}\left(z-8\right) = 0\)
Answer 2.
\(-5x+3y+2z = 0\)
11.6.2.12.
Answer 1.
\(3\mathopen{}\left(x-5\right)+3\mathopen{}\left(z-3\right) = 0\)
Answer 2.
\(3x+3z = 24\)
11.6.2.14.
Answer 1.
\(2\mathopen{}\left(x-1\right)+y-1-3\mathopen{}\left(z-1\right) = 0\)
Answer 2.
\(2x+y-3z = 0\)
11.6.2.16.
Answer 1.
\(4\mathopen{}\left(x-5\right)-2\mathopen{}\left(y-7\right)-2\mathopen{}\left(z-3\right) = 0\)
Answer 2.
\(4x-2y-2z = 0\)
11.6.2.17.
Answer 1.
\(x-5+y-7+z-3 = 0\)
Answer 2.
\(x+y+z = 15\)
11.6.2.18.
Answer 1.
\(4\mathopen{}\left(x-4\right)+y-1+z-1 = 0\)
Answer 2.
\(4x+y+z = 18\)
11.6.2.19.
Answer 1.
\(3\mathopen{}\left(x+4\right)+8\mathopen{}\left(y-7\right)-10\mathopen{}\left(z-2\right) = 0\)
Answer 2.
\(3x+8y-10z = 24\)
11.6.2.20.
Answer 1.
\(x-1 = 0\)
Answer 2.
\(x = 1\)
11.6.2.22.
Answer.
\(\left(1,3,3.5\right)+t\mathopen{}\left<20,2,-26\right>\)
11.6.2.24.
Answer.
\(\left(3,1,1\right)\)
11.6.2.26.
Answer.
\(\text{the entire line}\)
11.6.2.27.
Answer.
\(\sqrt{5/7}\)
11.6.2.28.
Answer.
\(\frac{8}{\sqrt{21}}\)
11.6.2.29.
Answer.
\(1/\sqrt{3}\)
11.6.2.30.
Answer.
\(3\)
12 Vector Valued Functions
12.1 Vector-Valued Functions
12.1.4 Exercises
Terms and Concepts
12.1.4.1.
Answer.
parametric equations
12.1.4.2.
Answer.
vectors
12.1.4.3.
Answer.
displacement
12.1.4.4.
Answer.
displacement
Problems
12.1.4.14.
Answer.
Graph of the function \(\vec r(t) = \la 3\cos(t) , \sin(t) , t/\pi\ra\) on \([0,2\pi]\text{.}\) The graph of the function is an oval-shaped spiral centered about the \(z\)-axis. Ignoring the \(z\)-axis, the curve is simply an oval having a horizontal width of \(6\) and a height of \(2\) in the \(xy\)-plane. Incorporating the \(z\) coordinate then creates the linearly increasing oval spiral, which begins at the point \((3,0,0)\text{,}\) completes precisely one full revolution and ends at the point \((3,0,2)\text{.}\)
12.1.4.15.
Answer.
Graph of the function \(\vec r(t) = \la \cos(t) , \sin(t) ,\sin(t) \ra\) on \([0,2\pi]\text{.}\) The graph of the function is an oval lying in the plane coming from rotating the \(xy\) plane \(45\) degrees towards the \(z\)-axis. The oval lying in this plane has a horizontal width of \(\sqrt{2}\) and a height of \(1\text{.}\) Ignoring the \(z\) coordinate, the curve is a unit circle in the \(xy\) plane. Similarly ignoring the \(y\) coordinate, the curve is a unit circle in the \(xz\) plane. If we now ignore the \(x\) coordinate, the resulting curve is a diagonal line given by \(z=y\) in the \(yz\) plane. This line turns back on itself, which can be seen in the image of the oval when considering all three coordinate axes.
12.1.4.16.
Answer.
Graph of the function \(\vec r(t) = \la \cos(t) , \sin(t) ,\sin(2t)\ra\) on \([0,2\pi]\text{.}\) The graph of the function resembles a saddle centered at the origin whose height is defined by the \(z\)-axis. The two sides of the saddle that taper off fall into negative \(z\) and lie in the second and third quadrants in the \(xy\) plane. Ignoring the \(z\) coordinate, the curve is a unit circle in the \(xy\) plane. Ignoring the \(x\) or \(y\) coordinates individually, the curve looks like the \(\infty\) symbol in the \(yz\) and the \(xz\) planes, respectively. We now describe the \(z\) coordinate with respect to travelling along the unit circle in the \(xy\) plane. Starting at \(t=\text{,}\) the function begins at the point \((1,0,0)\text{.}\) As \(t\) increases and we travel along the unit circle in the \(x\) and \(y\) coordinates, \(z\) increases until we get to \(t=\frac{\pi}{2}\) at which \(z=1\text{.}\) Then, continuing along the unit circle, \(z\) decreases until it reaches a minimum of \(z=-1\) when \(t=\frac{3\pi}{4}\text{.}\) Continuing along the circle, \(z\) begins to increase once again, reaching one more maximum of \(z=1\) when \(t=\frac{5\pi}{4}\text{.}\) Finally, \(z\) begins to decrease, reaching its last minimum of \(z=1\) when \(t=\frac{7\pi}{4}\text{,}\) after which \(z\) increases, and the curve ends where it began, at the point \((1,0,0)\text{.}\)
12.1.4.17.
Answer.
\(\left|t\right|\sqrt{1+t^{2}}\)
12.1.4.19.
Answer.
\(\sqrt{4+t^{2}}\)
12.1.4.21.
Answer.
\(\left<2\cos\mathopen{}\left(t\right)+1,2\sin\mathopen{}\left(t\right)+2\right>\)
12.1.4.25.
Answer.
\(\left<t+2,5t+3\right>\)
12.1.4.27.
Answer.
Specific forms may vary, though most direct solutions are
\(\vec r(t) = \la 1,2,3\ra +t\la 3,3,3\ra\) and
\(\vec r(t) = \la 3t+1, 3t+2, 3t+3\ra\text{.}\)
12.1.4.28.
Answer.
Specific forms may vary, though most direct solutions are
\(\vec r(t) = \la 1,2\ra +t\la 3,2\ra\) and
\(\vec r(t) = \la 3t+1, 2t+2\ra\text{.}\)
12.1.4.29.
Answer.
\(\left<2\cos\mathopen{}\left(t\right),2\sin\mathopen{}\left(t\right),2t\right>\)
12.1.4.31.
Answer.
\(\left<1,0\right>\)
12.1.4.33.
Answer.
\(\left<0,0,1\right>\)
12.2 Calculus and Vector-Valued Functions
12.2.5 Exercises
Terms and Concepts
12.2.5.1.
Answer.
component
12.2.5.2.
Answer.
displacement
12.2.5.4.
Answer.
A scalar-vector product, a dot product and a cross product.
Problems
12.2.5.5.
Answer.
\(\left<11,74,\sin\mathopen{}\left(5\right)\right>\)
12.2.5.6.
Answer.
\(\la e^3,0\ra\)
12.2.5.7.
Answer.
\(\left<1,e\right>\)
12.2.5.8.
Answer.
\(\la2t,1,0\ra\)
12.2.5.9.
Answer.
\(\left(-\infty ,0\right)\cup \left(0,\infty \right)\)
12.2.5.10.
Answer.
\((0,\infty)\)
12.2.5.11.
Answer.
\(\left<-\sin\mathopen{}\left(t\right),e^{t},\frac{1}{t}\right>\)
12.2.5.12.
Answer.
\(\vrp(t) = \la -1/t^2, 5/(3t+1)^2, \sec^2(t) \ra\)
12.2.5.13.
Answer.
\(\left<2t\sin\mathopen{}\left(t\right)+t^{2}\cos\mathopen{}\left(t\right),6t^{2}+10t\right>\)
12.2.5.14.
Answer.
\(\left(t^{2}+1\right)\cos\mathopen{}\left(t\right)+2t\sin\mathopen{}\left(t\right)+4t+3\)
12.2.5.15.
Answer.
\(\left<-1,\cos\mathopen{}\left(t\right)-2t,6t^{2}+10t+2+\cos\mathopen{}\left(t\right)-\sin\mathopen{}\left(t\right)-t\cos\mathopen{}\left(t\right)\right>\)
12.2.5.16.
Answer.
\(\vrp(t) = \la \sinh t,\cosh t\ra\)
12.2.5.21.
Answer.
\(\left<2+3t,t\right>\)
12.2.5.22.
Answer.
\(\left(\frac{3\sqrt{2}}{2},\frac{\sqrt{2}}{2}\right)+t\mathopen{}\left<\frac{-3\sqrt{2}}{2},\frac{\sqrt{2}}{2}\right>\)
12.2.5.23.
Answer.
\(\ell(t) = \la -3,0,\pi\ra + t\la0,-3,1\ra\)
12.2.5.24.
Answer.
\(\left(1,0,0\right)+t\mathopen{}\left<1,1,1\right>\)
12.2.5.26.
Answer.
\(1\)
12.2.5.28.
Answer.
\(1, -1\)
12.2.5.32.
Answer.
Both derivatives return \(\la 6t^5,3t^2,0\ra\)
12.2.5.33.
Answer.
\(\la \frac14t^4,\sin(t) ,te^t-e^t\ra + \vec C\)
12.2.5.34.
Answer.
\(\la \tan^{-1}(t) ,\tan(t) \ra + \vec C\)
12.2.5.35.
Answer.
\(\left<-2,0\right>\)
12.2.5.36.
Answer.
\(\la4,-4 \ra\)
12.2.5.37.
Answer.
\(\left<\frac{t^{2}}{2}+2,-\cos\mathopen{}\left(t\right)+3\right>\)
12.2.5.39.
Answer.
\(\left<\frac{t^{4}}{12}+t+4,\frac{t^{3}}{6}+2t+5,\frac{t^{2}}{2}+3t+6\right>\)
12.2.5.41.
Answer.
\(2\cdot 3.60555\pi \)
12.2.5.42.
Answer.
\(10\pi\)
12.2.5.43.
Answer.
\(\frac{1}{54}\mathopen{}\left(22^{\frac{3}{2}}-8\right)\)
12.2.5.44.
Answer.
\(\sqrt{2}(1-e^{-1})\)
12.3 The Calculus of Motion
12.3.3 Exercises
Terms and Concepts
12.3.3.4.
Answer.
arc length
Problems
12.3.3.7.
Answer.
\(\vvt = \la 2,5,0\ra\text{,}\) \(\vat = \la 0,0,0\ra\)
12.3.3.8.
Answer 1.
\(\left<6t-2,-2t+1\right>\)
Answer 2.
\(\left<6,-2\right>\)
12.3.3.10.
Answer 1.
\(\left<\frac{1}{10},\sin\mathopen{}\left(t\right),\cos\mathopen{}\left(t\right)\right>\)
Answer 2.
\(\left<0,\cos\mathopen{}\left(t\right),-\sin\mathopen{}\left(t\right)\right>\)
12.3.3.16.
Answer 1.
\(\left|t\right|\sqrt{9t^{2}-12t+8}\)
Answer 2.
\(0\)
Answer 3.
\(-1\)
12.3.3.19.
Answer 1.
\(\left|\sec\mathopen{}\left(t\right)\right|\sqrt{\tan^{2}\mathopen{}\left(t\right)+\sec^{2}\mathopen{}\left(t\right)}\)
Answer 2.
\(0\)
Answer 3.
\(\frac{\pi }{4}\)
12.3.3.22.
Answer 1.
\(\sqrt{8t^{2}+3}\)
Answer 2.
\(0\)
Answer 3.
\(1\)
12.3.3.30.
Answer.
\(\left<t^{2}-t+5,\frac{3t^{2}}{2}-t-\frac{5}{2}\right>\)
12.3.3.32.
Answer.
\(\left<10t,-16t^{2}+50t\right>\)
12.3.3.34.
Answer 1.
\(\left<-10,0\right>\)
Answer 2.
\(5\pi \)
Answer 3.
\(\left<\frac{-10}{\pi },0\right>\)
Answer 4.
\(5\)
12.3.3.36.
Answer 1.
\(\left<10,20,-10\right>\)
Answer 2.
\(10\sqrt{6}\)
Answer 3.
\(\left<1,2,-1\right>\)
Answer 4.
\(\sqrt{6}\)
12.3.3.38.
12.3.3.38.a
Answer.
\(t=\sin^{-1}(3/20)/(8\pi) + n/4 \approx 0.006 + n/4\text{,}\) where \(n\) is an integer
12.3.3.38.b
Answer.
\(\norm{\vrp(t)} = 24\pi\approx 51.4\) ft/s
12.3.3.38.c
Answer.
\(0.27\) radians, or \(15.69^\circ\)
12.3.3.39.
Answer.
\(0.013\ {\rm radians}\)
Answer.
\(11.7\ {\rm ft}\)
12.4 Unit Tangent and Normal Vectors
12.4.4 Exercises
Terms and Concepts
12.4.4.1.
Answer.
\(1\)
12.4.4.2.
Answer.
\(0\)
12.4.4.3.
Answer.
\(\unittangent(t)\) and \(\unitnormal(t)\text{.}\)
12.4.4.4.
Answer.
the speed
Problems
12.4.4.5.
Answer.
\(\unittangent(t) = \la\frac{4 t}{\sqrt{20 t^2-4t+1}},\frac{2 t-1}{\sqrt{20 t^2-4t+1}}\ra\text{;}\) \(\unittangent(1) = \la 4/\sqrt{17},1/\sqrt{17}\ra\)
12.4.4.6.
Answer 1.
\(\left<\frac{1}{\sqrt{1+\sin^{2}\mathopen{}\left(t\right)}},\frac{-\sin\mathopen{}\left(t\right)}{\sqrt{1+\sin^{2}\mathopen{}\left(t\right)}}\right>\)
Answer 2.
\(\left<\sqrt{\frac{2}{3}},\frac{-1}{\sqrt{3}}\right>\)
12.4.4.8.
Answer 1.
\(\left<-\sin\mathopen{}\left(t\right),\cos\mathopen{}\left(t\right)\right>\)
Answer 2.
\(\left<0,-1\right>\)
12.4.4.9.
Answer.
\(\left(2,0\right)+t\mathopen{}\left<\frac{4}{\sqrt{17}},\frac{1}{\sqrt{17}}\right>\)
12.4.4.10.
Answer.
\(\left(\frac{\pi }{4},\frac{\sqrt{2}}{2}\right)+t\mathopen{}\left<\sqrt{\frac{2}{3}},\frac{-1}{\sqrt{3}}\right>\)
12.4.4.12.
Answer.
\(\left(-1,0\right)+t\mathopen{}\left<0,-1\right>\)
12.4.4.13.
Answer.
\(\unittangent(t) = \la -\sin(t) ,\cos(t) \ra\text{;}\) \(\unitnormal(t) = \la -\cos(t) ,-\sin(t) \ra\)
12.4.4.14.
Answer.
\(\unittangent(t) = \la \frac{1}{\sqrt{1+4t^2}},\frac{2t}{\sqrt{1+4t^2}}\ra\text{;}\) \(\unitnormal(t) = \la -\frac{2t}{\sqrt{1+4t^2}},\frac{1}{\sqrt{1+4t^2}}\ra\)
12.4.4.15.
Answer.
\(\unittangent(t) = \la -\frac{\sin(t) }{\sqrt{4\cos^2(t) +\sin^2(t) }},\frac{2\cos(t) }{\sqrt{4\cos^2(t) +\sin^2(t) }}\ra\text{;}\) \(\unitnormal(t) = \la -\frac{2\cos(t) }{\sqrt{4\cos^2(t) +\sin^2(t) }},-\frac{\sin(t) }{\sqrt{4\cos^2(t) +\sin^2(t) }}\ra\)
12.4.4.16.
Answer.
\(\unittangent(t) = \la \frac{e^t}{\sqrt{e^{2t}+e^{-2t}}},-\frac{e^{-t}}{\sqrt{e^{2t}+e^{-2t}}}\ra\text{;}\) \(\unitnormal(t) = \la \frac{e^{-t}}{\sqrt{e^{2t}+e^{-2t}}},\frac{e^{t}}{\sqrt{e^{2t}+e^{-2t}}}\ra\)
12.4.4.22.
Answer.
\(\left<-\cos\mathopen{}\left(t\right),\frac{-3}{5}\sin\mathopen{}\left(t\right),\frac{-4}{5}\sin\mathopen{}\left(t\right)\right>\)
12.4.4.24.
Answer.
\(\left<-\cos\mathopen{}\left(at\right),-\sin\mathopen{}\left(at\right),0\right>\)
12.4.4.26.
Answer 1.
\(\frac{\frac{-2}{t^{5}}}{\sqrt{1+\frac{1}{t^{4}}}}\)
Answer 2.
\(\frac{\frac{2}{t^{3}}}{\sqrt{1+\frac{1}{t^{4}}}}\)
Answer 3.
\(-\sqrt{2}\)
Answer 4.
\(\sqrt{2}\)
Answer 5.
\(\frac{-1}{4\sqrt{17}}\)
Answer 6.
\(\frac{1}{\sqrt{17}}\)
12.4.4.28.
Answer 1.
\(2\)
Answer 2.
\(4t^{2}\)
Answer 3.
\(2\)
Answer 4.
\(2\pi \)
Answer 5.
\(2\)
Answer 6.
\(4\pi \)
12.4.4.30.
Answer 1.
\(0\)
Answer 2.
\(5\)
Answer 3.
\(0\)
Answer 4.
\(5\)
Answer 5.
\(0\)
Answer 6.
\(5\)
12.5 The Arc Length Parameter and Curvature
12.5.4 Exercises
Terms and Concepts
12.5.4.1.
Answer.
time and/or distance
12.5.4.2.
Answer.
curvature
12.5.4.3.
Answer.
Answers may include lines, circles, helixes
12.5.4.4.
Answer.
Answers will vary; they should mention the circle is tangent to the curve and has the same curvature as the curve at that point.
12.5.4.5.
Answer.
\(\kappa\)
12.5.4.6.
Answer.
\(a_\text{T}\) is not affected by curvature; the greater the curvature, the larger \(a_\text{N}\) becomes.
Problems
12.5.4.8.
Answer 1.
\(7t\)
Answer 2.
\(\left<7\cos\mathopen{}\left(\frac{s}{7}\right),7\sin\mathopen{}\left(\frac{s}{7}\right)\right>\)
12.5.4.10.
Answer 1.
\(13t\)
Answer 2.
\(\left<5\cos\mathopen{}\left(\frac{s}{13}\right),13\sin\mathopen{}\left(\frac{s}{13}\right),12\cos\mathopen{}\left(\frac{s}{13}\right)\right>\)
12.5.4.12.
Answer 1.
\(\text{greater than}\)
Answer 2.
\(\frac{\left|\frac{6x^{2}-2}{\left(x^{2}+1\right)^{3}}\right|}{\left(1+\frac{4x^{2}}{\left(x^{2}+1\right)^{4}}\right)^{\frac{3}{2}}}\)
Answer 3.
\(2\)
Answer 4.
\(\frac{2750}{641^{\frac{3}{2}}}\)
12.5.4.15.
Answer 1.
\(\text{less than}\)
Answer 2.
\(\frac{\left|2\cos\mathopen{}\left(t\right)\cos\mathopen{}\left(2t\right)+4\sin\mathopen{}\left(t\right)\sin\mathopen{}\left(2t\right)\right|}{\left(4\cos^{2}\mathopen{}\left(2t\right)+\sin^{2}\mathopen{}\left(t\right)\right)^{\frac{3}{2}}}\)
Answer 3.
\(\frac{1}{4}\)
Answer 4.
\(8\)
12.5.4.18.
Answer 1.
\(\text{greater than}\)
Answer 2.
\(\frac{\left|\sec^{3}\mathopen{}\left(t\right)\right|}{\left(\sec^{4}\mathopen{}\left(t\right)+\sec^{2}\mathopen{}\left(t\right)\tan^{2}\mathopen{}\left(t\right)\right)^{\frac{3}{2}}}\)
Answer 3.
\(1\)
Answer 4.
\(\frac{3\sqrt{3}}{5\sqrt{5}}\)
12.5.4.20.
Answer 1.
\(\text{greater than}\)
Answer 2.
\(\frac{2\sqrt{18t^{4}+15t^{2}+1}}{\left(18t^{4}-2t^{2}+1\right)^{\frac{3}{2}}}\)
Answer 3.
\(2\)
Answer 4.
\(\frac{2\sqrt{2}}{17}\)
12.5.4.22.
Answer 1.
\(\text{equal to}\)
Answer 2.
\(\frac{1}{13}\)
Answer 3.
\(\frac{1}{13}\)
Answer 4.
\(\frac{1}{13}\)
12.5.4.23.
Answer.
\(\frac{\sqrt{2}}{\sqrt[4]{5}}, \frac{-\sqrt{2}}{\sqrt[4]{5}}\)
12.5.4.25.
Answer.
\(\frac{1}{4}\)
12.5.4.26.
Answer.
\(\sqrt{5}, -\sqrt{5}\)
12.5.4.28.
Answer.
\(5\sqrt{10}\)
12.5.4.30.
Answer.
\(\frac{1}{45}\)
12.5.4.32.
Answer.
\(\left(x-\frac{8}{3}\right)^{2}+y^{2} = \frac{1}{9}\)
12.5.4.34.
Answer.
\(\left(x-\frac{1}{2}\right)^{2}+\left(y-\frac{1}{2}\right)^{2} = \frac{1}{2}\)
13 Introduction to Functions of Several Variables
13.2 Limits and Continuity of Multivariable Functions
13.2.5 Exercises
Problems
13.2.5.7.
Answer.
- Answers will vary. interior point: \((1,3)\) boundary point: \((3,3)\)
- \(S\) is a closed set
- \(S\) is bounded
13.2.5.8.
Answer.
- Answers will vary. Interior point: \((1,0)\) (any point with \(y\neq x^2\) will do). Boundary point: \((1,1)\) (any point with \(y=x^2\) will do).
- \(S\) is an open set.
- \(S\) is unbounded.
13.2.5.11.
Answer.
- \(D = \left\{(x,y)\, |\, 9-x^2-y^2\geq 0\right\}\text{.}\)
- \(D\) is a closed set.
- \(D\) is bounded.
13.2.5.12.
Answer.
- \(D = \left\{(x,y)\, |\, y\geq x^2\right\}\text{.}\)
- \(D\) is a closed set.
- \(D\) is unbounded.
13.2.5.13.
Answer.
- \(D = \left\{(x,y)\, |\, y \gt x^2\right\}\text{.}\)
- \(D\) is an open set.
- \(D\) is unbounded.
13.2.5.14.
Answer.
- \(D = \left\{(x,y)\, |\, (x,y)\neq (0,0) \right\}\text{.}\)
- \(D\) is an open set.
- \(D\) is unbounded.
13.3 Partial Derivatives
13.3.7 Exercises
Terms and Concepts
13.3.7.3.
Answer.
\({\verb!f_x!}\)
13.3.7.4.
Answer.
\({\verb!f_y!}\)
Problems
13.3.7.6.
Answer 1.
\(0\)
Answer 2.
\(0\)
13.3.7.8.
Answer 1.
\(-{\frac{1}{2}}\)
Answer 2.
\(-{\frac{1}{3}}\)
13.3.7.10.
Answer 1.
\(3x^{2}+6xy+3y^{2}\)
Answer 2.
\(3x^{2}+6xy+3y^{2}\)
Answer 3.
\(6x+6y\)
Answer 4.
\(6x+6y\)
Answer 5.
\(6x+6y\)
Answer 6.
\(6x+6y\)
13.3.7.12.
Answer 1.
\(\frac{-4}{x^{2}y}\)
Answer 2.
\(\frac{-4}{xy^{2}}\)
Answer 3.
\(\frac{8}{x^{3}y}\)
Answer 4.
\(\frac{4}{x^{2}y^{2}}\)
Answer 5.
\(\frac{4}{x^{2}y^{2}}\)
Answer 6.
\(\frac{8}{xy^{3}}\)
13.3.7.14.
Answer 1.
\(e^{x+2y}\)
Answer 2.
\(2e^{x+2y}\)
Answer 3.
\(e^{x+2y}\)
Answer 4.
\(2e^{x+2y}\)
Answer 5.
\(2e^{x+2y}\)
Answer 6.
\(4e^{x+2y}\)
13.3.7.16.
Answer 1.
\(3\mathopen{}\left(x+y\right)^{2}\)
Answer 2.
\(3\mathopen{}\left(x+y\right)^{2}\)
Answer 3.
\(6\mathopen{}\left(x+y\right)\)
Answer 4.
\(6\mathopen{}\left(x+y\right)\)
Answer 5.
\(6\mathopen{}\left(x+y\right)\)
Answer 6.
\(6\mathopen{}\left(x+y\right)\)
13.3.7.18.
Answer 1.
\(10x\cos\mathopen{}\left(5x^{2}+2y^{3}\right)\)
Answer 2.
\(6y^{2}\cos\mathopen{}\left(5x^{2}+2y^{3}\right)\)
Answer 3.
\(10\cos\mathopen{}\left(5x^{2}+2y^{3}\right)-100x^{2}\sin\mathopen{}\left(5x^{2}+2y^{3}\right)\)
Answer 4.
\(-60xy^{2}\sin\mathopen{}\left(5x^{2}+2y^{3}\right)\)
Answer 5.
\(-60xy^{2}\sin\mathopen{}\left(5x^{2}+2y^{3}\right)\)
Answer 6.
\(12y\cos\mathopen{}\left(5x^{2}+2y^{3}\right)-36y^{4}\sin\mathopen{}\left(5x^{2}+2y^{3}\right)\)
13.3.7.19.
Answer 1.
\(\frac{2y^{2}}{\sqrt{4xy^{2}+1}}\)
Answer 2.
\(\frac{4xy}{\sqrt{4xy^{2}+1}}\)
Answer 3.
\(\frac{-4y^{4}}{\left(\sqrt{4xy^{2}+1}\right)^{3}}\)
Answer 4.
\(\frac{-8xy^{3}}{\left(\sqrt{4xy^{2}+1}\right)^{3}}+\frac{4y}{\sqrt{4xy^{2}+1}}\)
Answer 5.
\(\frac{-8xy^{3}}{\left(\sqrt{4xy^{2}+1}\right)^{3}}+\frac{4y}{\sqrt{4xy^{2}+1}}\)
Answer 6.
\(\frac{-16x^{2}y^{2}}{\left(\sqrt{4xy^{2}+1}\right)^{3}}+\frac{4x}{\sqrt{4xy^{2}+1}}\)
13.3.7.22.
Answer 1.
\(5\)
Answer 2.
\(-17\)
Answer 3.
\(0\)
Answer 4.
\(0\)
Answer 5.
\(0\)
Answer 6.
\(0\)
13.3.7.24.
Answer 1.
\(\frac{2x}{x^{2}+y}\)
Answer 2.
\(\frac{1}{x^{2}+y}\)
Answer 3.
\(\frac{-4x^{2}}{\left(x^{2}+y\right)^{2}}+\frac{2}{x^{2}+y}\)
Answer 4.
\(\frac{-2x}{\left(x^{2}+y\right)^{2}}\)
Answer 5.
\(\frac{-2x}{\left(x^{2}+y\right)^{2}}\)
Answer 6.
\(\frac{-1}{\left(x^{2}+y\right)^{2}}\)
13.3.7.26.
Answer 1.
\(5e^{x}\sin\mathopen{}\left(y\right)\)
Answer 2.
\(5e^{x}\cos\mathopen{}\left(y\right)\)
Answer 3.
\(5e^{x}\sin\mathopen{}\left(y\right)\)
Answer 4.
\(5e^{x}\cos\mathopen{}\left(y\right)\)
Answer 5.
\(5e^{x}\cos\mathopen{}\left(y\right)\)
Answer 6.
\(-5e^{x}\sin\mathopen{}\left(y\right)\)
13.3.7.28.
Answer.
\(\frac{1}{2}x^{2}+xy+\frac{1}{2}y^{2}\)
13.3.7.30.
Answer.
\(\ln\mathopen{}\left(x^{2}+y^{2}\right)\)
13.3.7.32.
Answer 1.
\(3x^{2}y^{2}+3x^{2}z\)
Answer 2.
\(2x^{3}y+2yz\)
Answer 3.
\(x^{3}+y^{2}\)
Answer 4.
\(2y\)
Answer 5.
\(2y\)
13.3.7.34.
Answer 1.
\(\frac{1}{x}\)
Answer 2.
\(\frac{1}{y}\)
Answer 3.
\(\frac{1}{z}\)
Answer 4.
\(0\)
Answer 5.
\(0\)
IV Math 2580: Calculus IV
14 Functions of Several Variables, Continued
14.2 The Multivariable Chain Rule
14.2.3 Exercises
Terms and Concepts
14.2.3.2.
Answer.
\(g'(x)\)
14.2.3.4.
Answer.
T
14.2.3.5.
Answer.
F
14.2.3.6.
Answer.
\(\text{partial}\)
Problems
14.2.3.7.
Answer.
- \(\frac{dz}{dt} = 3(2t)+4(2) = 6t+8\text{.}\)
- At \(t=1\text{,}\) \(\frac{dz}{dt} = 14\text{.}\)
14.2.3.8.
Answer 1.
\(2x-4yt\)
Answer 2.
\(2\)
14.2.3.9.
Answer.
- \(\displaystyle \frac{dz}{dt} = 5(-2\sin(t) )+2(\cos(t) ) = -10\sin(t) +2\cos(t)\)
- At \(t=\pi/4\text{,}\) \(\frac{dz}{dt} = -4\sqrt{2}\text{.}\)
14.2.3.10.
Answer 1.
\(\frac{-\sin\mathopen{}\left(t\right)}{1+y^{2}}-\frac{2xy\cos\mathopen{}\left(t\right)}{\left(y^{2}+1\right)^{2}}\)
Answer 2.
\(-{\frac{1}{2}}\)
14.2.3.11.
Answer.
- \(\ds\frac{dz}{dt} = 2x(\cos(t) ) + 4y(3\cos(t) )\text{.}\)
- At \(t=\pi/4\text{,}\) \(x=\sqrt{2}/2\text{,}\) \(y=3\sqrt{2}/2\text{,}\) and \(\frac{dz}{dt} = 19\text{.}\)
14.2.3.12.
Answer 1.
\(-\sin\mathopen{}\left(x\right)\sin\mathopen{}\left(y\right)\pi +\cos\mathopen{}\left(x\right)\cos\mathopen{}\left(y\right)\cdot 2\pi \)
Answer 2.
\(0\)
14.2.3.14.
Answer.
\(-\sqrt{\frac{3}{2}}, 0, \sqrt{\frac{3}{2}}\)
14.2.3.16.
Answer.
\(0, \pi \)
14.2.3.18.
Answer.
\(0, \frac{1}{\pi }\tan^{-1}\mathopen{}\left(\sqrt{5}\right), 1-\frac{1}{\pi }\tan^{-1}\mathopen{}\left(\sqrt{5}\right), 1, 1+\frac{1}{\pi }\tan^{-1}\mathopen{}\left(\sqrt{5}\right), 2-\frac{1}{\pi }\tan^{-1}\mathopen{}\left(\sqrt{5}\right)\)
14.2.3.20.
Answer 1.
\(-\pi \sin\mathopen{}\left(\pi x+\frac{\pi y}{2}\right)t^{2}-\frac{1}{2}\pi \sin\mathopen{}\left(\pi x+\frac{\pi y}{2}\right)\cdot 2st\)
Answer 2.
\(-\pi \sin\mathopen{}\left(\pi x+\frac{\pi y}{2}\right)\cdot 2st-\frac{1}{2}\pi \sin\mathopen{}\left(\pi x+\frac{\pi y}{2}\right)s^{2}\)
Answer 3.
\(2\pi \)
Answer 4.
\(\frac{5\pi }{2}\)
14.2.3.21.
Answer 1.
\(2x\cos\mathopen{}\left(t\right)+2y\sin\mathopen{}\left(t\right)\)
Answer 2.
\(-2xs\sin\mathopen{}\left(t\right)+2ys\cos\mathopen{}\left(t\right)\)
Answer 3.
\(4\)
Answer 4.
\(0\)
14.2.3.22.
Answer 1.
\(-2yt^{2}e^{-\left(x^{2}+y^{2}\right)}\)
Answer 2.
\(-2xe^{-\left(x^{2}+y^{2}\right)}-4stye^{-\left(x^{2}+y^{2}\right)}\)
Answer 3.
\(\frac{-2}{e^{2}}\)
Answer 4.
\(\frac{-6}{e^{2}}\)
14.2.3.24.
Answer.
\(\frac{-x}{y^{2}}\)
14.2.3.26.
Answer.
\(\frac{-\left(2x+y\right)}{2y+x}\)
14.2.3.28.
Answer.
\(0\)
14.2.3.30.
Answer 1.
\(-2\)
Answer 2.
\(5\)
14.3 Directional Derivatives
14.3.3 Exercises
Terms and Concepts
14.3.3.2.
Answer.
\(\boldsymbol{i}\)
14.3.3.3.
Answer.
\(\boldsymbol{j}\)
14.3.3.4.
Answer.
\(\text{orthogonal}\)
14.3.3.6.
Answer.
\(\text{dot}\)
Problems
14.3.3.8.
Answer.
\(\left<\cos\mathopen{}\left(x\right)\cos\mathopen{}\left(y\right),-\sin\mathopen{}\left(x\right)\sin\mathopen{}\left(y\right)\right>\)
14.3.3.10.
Answer.
\(\left<-4,3\right>\)
14.3.3.12.
Answer.
\(\left<2xy^{3}-2,3x^{2}y^{2}\right>\)
14.3.3.13.
14.3.3.13.a
Answer.
\(2/5\)
14.3.3.13.b
Answer.
\(-2/\sqrt{5}\)
14.3.3.14.
Answer.
\(\frac{1}{4}\mathopen{}\left(1-\sqrt{3}\right)\)
Answer.
\(\frac{4\sqrt{3}-3}{10\sqrt{2}}\)
14.3.3.15.
14.3.3.15.a
Answer.
\(0\)
14.3.3.15.b
Answer.
\(2\sqrt{2}/9\)
14.3.3.16.
Answer.
\(\frac{-9}{\sqrt{10}}\)
Answer.
\(\frac{27}{\sqrt{34}}\)
14.3.3.17.
14.3.3.17.a
Answer.
\(0\)
14.3.3.17.b
Answer.
\(0\)
14.3.3.18.
Answer.
\(\frac{3}{\sqrt{2}}\)
Answer.
\(3\)
14.3.3.19.
14.3.3.19.a
Answer.
\(\nabla f(2,1) = \la -2,2\ra\)
14.3.3.19.b
Answer.
\(\sqrt{8}\)
14.3.3.19.c
Answer.
\(\la 2, -2\ra\)
14.3.3.19.d
Answer.
\(\vec u = \la 1/\sqrt{2},1/\sqrt{2}\ra\)
14.3.3.20.
Answer.
\(\left<\frac{1}{2\sqrt{2}},\frac{-1}{2}\sqrt{\frac{3}{2}}\right>\)
Answer.
\(\frac{1}{\sqrt{2}}\)
Answer.
\(\left<\frac{-1}{2\sqrt{2}},\frac{1}{2}\sqrt{\frac{3}{2}}\right>\)
Answer.
\(\left<\frac{1}{2}\sqrt{\frac{3}{2}},\frac{1}{2\sqrt{2}}\right>\)
14.3.3.21.
14.3.3.21.a
Answer.
\(\nabla f(1,1) = \la -2/9,-2/9\ra\)
14.3.3.21.b
Answer.
\(2\sqrt{2}/9\)
14.3.3.21.c
Answer.
\(\la 2/9,2/9\ra\)
14.3.3.21.d
Answer.
\(\vec u = \la 1/\sqrt{2},-1/\sqrt{2}\ra\)
14.3.3.22.
Answer.
\(\left<-4,3\right>\)
Answer.
\(5\)
Answer.
\(\left<4,-3\right>\)
Answer.
\(\left<3,4\right>\)
14.3.3.23.
14.3.3.23.a
Answer.
No such direction
14.3.3.23.b
Answer.
\(0\)
14.3.3.23.c
Answer.
No such direction
14.3.3.23.d
Answer.
All directions
14.3.3.24.
Answer.
\(\left<0,3\right>\)
Answer.
\(3\)
Answer.
\(\left<0,-3\right>\)
Answer.
\(\left<1,0\right>\)
14.3.3.25.
14.3.3.25.a
Answer.
\(\nabla F(x,y,z) = \la 6xz^3+4y, 4x, 9x^2z^2-6z\ra\)
14.3.3.25.b
Answer.
\(113/\sqrt{3}\)
14.3.3.26.
Answer.
\(\left<\cos\mathopen{}\left(x\right)\cos\mathopen{}\left(y\right)e^{z},-\sin\mathopen{}\left(x\right)\sin\mathopen{}\left(y\right)e^{z},\sin\mathopen{}\left(x\right)\cos\mathopen{}\left(y\right)e^{z}\right>\)
Answer.
\(\frac{2}{3}\)
14.3.3.27.
14.3.3.27.a
Answer.
\(\nabla F(x,y,z) = \la 2xy^2, 2y(x^2-z^2), -2y^2z\ra\)
14.3.3.27.b
Answer.
\(0\)
14.3.3.28.
Answer.
\(\left<\frac{-4x}{\left(x^{2}+y^{2}+z^{2}\right)^{2}},\frac{-4y}{\left(x^{2}+y^{2}+z^{2}\right)^{2}},\frac{-4z}{\left(x^{2}+y^{2}+z^{2}\right)^{2}}\right>\)
Answer.
\(0\)
14.4 Tangent Lines, Normal Lines, and Tangent Planes
14.4.5 Exercises
Terms and Concepts
14.4.5.3.
Answer.
\(\text{True}\)
Problems
14.4.5.6.
Answer 1.
\(x = \frac{\pi }{3}+t, y = \frac{\pi }{6}, z = \frac{3}{4}-\frac{3\sqrt{3}}{4}t\)
Answer 2.
\(x = \frac{\pi }{3}, y = \frac{\pi }{6}+t, z = \frac{3}{4}+\frac{3\sqrt{3}}{4}t\)
Answer 3.
\(x = \frac{\pi }{3}+\frac{t}{\sqrt{5}}, y = \frac{\pi }{6}+\frac{2t}{\sqrt{5}}, z = \frac{3}{4}+\frac{3\sqrt{\frac{3}{5}}}{4}t\)
14.4.5.8.
Answer 1.
\(x = 1+t, y = 2, z = 3\)
Answer 2.
\(x = 1, y = 2+t, z = 3\)
Answer 3.
\(x = 1+\frac{t}{\sqrt{2}}, y = 2+\frac{t}{\sqrt{2}}, z = 3\)
14.4.5.10.
Answer.
\(x = \frac{\pi }{3}-\frac{3\sqrt{3}}{4}t, y = \frac{\pi }{6}+\frac{3\sqrt{3}}{4}t, z = \frac{3}{4}-t\)
14.4.5.12.
Answer.
\(x = 1, y = 2, z = 3-t\)
14.4.5.18.
Answer.
\(1.29904y-1.29904x-z = -1.43017\)
14.4.5.20.
Answer.
\(z = 3\)
14.4.5.22.
Answer 1.
\(x = 4-2t, y = -3+\frac{2}{3}t, z = \sqrt{5}+2\sqrt{5}t\)
Answer 2.
\(0.666667y-2x+4.47214z = 0\)
14.4.5.24.
Answer 1.
\(x = 2+\frac{\pi }{8\sqrt{3}}t, y = \frac{\pi }{12}-\sqrt{3}t, z = 4-\frac{\pi }{8\sqrt{3}}t\)
Answer 2.
\(0.226725x-1.73205y-0.226725z = -0.9069\)
14.5 Extreme Values
14.5.3 Exercises
Terms and Concepts
14.5.3.1.
Answer.
\(\text{False}\)
14.5.3.2.
Answer.
\(\text{True}\)
14.5.3.3.
Answer.
\(\text{True}\)
Problems
14.5.3.6.
Answer 1.
\(\text{NONE}\)
Answer 2.
\(\text{NONE}\)
Answer 3.
\(\left(7,-6\right)\)
Answer 4.
\(\text{NONE}\)
14.5.3.8.
Answer 1.
\(\left(0,0\right)\)
Answer 2.
\(\text{NONE}\)
Answer 3.
\(\text{NONE}\)
Answer 4.
\(\text{NONE}\)
14.5.3.10.
Answer 1.
\(\left(-1,-2\right)\)
Answer 2.
\(\left(1,2\right)\)
Answer 3.
\(\left(1,-2\right), \left(-1,2\right)\)
Answer 4.
\(\text{NONE}\)
14.5.3.12.
Answer 1.
\(\left(0,-3\right)\)
Answer 2.
\(\left(-1,3\right), \left(1,3\right)\)
Answer 3.
\(\left(-1,-3\right), \left(0,3\right), \left(1,-3\right)\)
Answer 4.
\(\text{NONE}\)
14.5.3.14.
Answer 1.
\(\text{NONE}\)
Answer 2.
\(\text{NONE}\)
Answer 3.
\(\text{NONE}\)
Answer 4.
\(\left(0,0\right)\)
14.5.3.15.
Answer 1.
\(3\)
Answer 2.
\(\left(0,1\right)\)
Answer 3.
\(\frac{3}{4}\)
Answer 4.
\(\left(0,\frac{-1}{2}\right)\)
14.5.3.16.
Answer 1.
\(\frac{25}{28}\)
Answer 2.
\(\left(\frac{5}{14},\frac{25}{196}\right)\)
Answer 3.
\(-12\)
Answer 4.
\(\left(-1,1\right)\)
15 Multiple Integration
15.1 Iterated Integrals and Area
15.1.4 Exercises
Terms and Concepts
15.1.4.2.
Answer.
iterated integration
15.1.4.3.
Answer.
curve to curve, then from point to point
15.1.4.4.
Answer.
area
Problems
15.1.4.5.
15.1.4.5.a
Answer.
\(18x^2+42x-117\)
15.1.4.5.b
Answer.
\(-108\)
15.1.4.6.
Answer.
\(2+\pi ^{2}\cos\mathopen{}\left(y\right)\)
Answer.
\(\pi ^{2}+\pi \)
15.1.4.7.
15.1.4.7.a
Answer.
\(x^4/2-x^2+2x-3/2\)
15.1.4.7.b
Answer.
\(23/15\)
15.1.4.8.
Answer.
\(\frac{y^{4}}{2}-y^{3}+\frac{y^{2}}{2}\)
Answer.
\(\frac{8}{15}\)
15.1.4.9.
15.1.4.9.a
Answer.
\(\sin^2(y)\)
15.1.4.9.b
Answer.
\(\pi/2\)
15.1.4.10.
Answer.
\(\frac{x}{1+x^{2}}\)
Answer.
\(\frac{1}{2}\ln\mathopen{}\left(\frac{5}{2}\right)\)
15.3 Double Integration with Polar Coordinates
Exercises
Problems
15.3.3.
Answer.
\(4\pi \)
15.3.5.
Answer.
\(16\pi \)
15.3.8.
Answer.
\(\frac{\pi }{2}\)
15.3.12.
Answer.
\(\frac{128}{3}\)
15.5 Surface Area
Exercises
Problems
15.5.7.
Answer.
\(\ds SA = \int_0^{2\pi}\int_0^{2\pi} \sqrt{1+ \cos^2(x) \cos^2(y) +\sin^2(x) \sin^2(y) }\, dx\, dy\)
15.5.8.
Answer.
\(\ds SA = \int_{-3}^{3}\int_{-\sqrt{9-x^2}}^{\sqrt{9-x^2}} \sqrt{1+ \frac{4x^2+4y^2}{(1+x^2+y^2)^4}}\, dx\, dy\)
Polar offers simpler bounds:
\(\ds SA = \int_0^{2\pi}\int_0^3 r\sqrt{1+\frac{4r^2}{(1+r^2)^4}}\, dr\, d\theta\)
15.5.9.
Answer.
\(\ds SA = \int_{-1}^{1}\int_{-1}^{1} \sqrt{1+ 4x^2+4y^2}\, dx\, dy\)
15.5.10.
Answer.
\(\ds SA = \int_{-5}^{5}\int_{0}^{1} \sqrt{1+ \frac{4x^2e^{2x^2}}{\big(1+e^{x^2}\big)^4}}\, dy\, dx\)
15.6 Volume Between Surfaces and Triple Integration
15.6.4 Exercises
Problems
15.6.4.6.
Answer.
\(52\)
15.6.4.8.
Answer.
\(\frac{3\pi }{2}\)
15.6.4.9.
Answer.
\(dz\, dy\, dx\text{:}\) \(\ds\int_0^3\int_0^{1-x/3}\int_0^{2-2x/3-2y}\, dz\, dy\, dx\)
\(dz\, dx\, dy\text{:}\) \(\ds\int_0^1\int_0^{3-3y}\int_0^{2-2x/3-2y}\, dz\, dx\, dy\)
\(dy\, dz\, dx\text{:}\) \(\ds\int_0^3\int_0^{2-2x/3}\int_0^{1-x/3-z/2}\, dy\, dz\, dx\)
\(dy\, dx\, dz\text{:}\) \(\ds\int_0^2\int_0^{3-3z/2}\int_0^{1-x/3-z/2}\, dy\, dx\, dz\)
\(dx\, dz\, dy\text{:}\) \(\ds\int_0^1\int_0^{2-2y}\int_0^{3-3y-3z/2}\, dx\, dz\, dy\)
\(dx\, dy\, dz\text{:}\) \(\ds\int_0^2\int_0^{1-z/2}\int_0^{3-3y-3z/2}\, dx\, dy\, dz\)
\(\ds V = \int_0^3\int_0^{1-x/3}\int_0^{2-2x/3-2y}\, dz\, dy\, dx =1\text{.}\)
15.6.4.10.
Answer.
\(dz\, dy\, dx\text{:}\) \(\ds\int_1^3\int_0^{2}\int_0^{(3-x)/2}\, dz\, dy\, dx\)
\(dz\, dx\, dy\text{:}\) \(\ds\int_0^2\int_1^{3}\int_0^{(3-x)/2}\, dz\, dx\, dy\)
\(dy\, dz\, dx\text{:}\) \(\ds\int_1^3\int_0^{(3-x)/2}\int_0^{2}\, dy\, dz\, dx\)
\(dy\, dx\, dz\text{:}\) \(\ds\int_0^1\int_1^{3-2z}\int_0^{2}\, dy\, dx\, dz\)
\(dx\, dz\, dy\text{:}\) \(\ds\int_0^2\int_0^{1}\int_1^{3-2z}\, dx\, dz\, dy\)
\(dx\, dy\, dz\text{:}\) \(\ds\int_0^1\int_0^{2}\int_1^{3-2z}\, dx\, dy\, dz\)
\(\ds V = \int_0^1\int_0^{2}\int_1^{3-2z}\, dx\, dy\, dz =2\text{.}\)
15.6.4.11.
Answer.
\(dz\, dy\, dx\text{:}\) \(\ds\int_0^2\int_{-2}^{0}\int_{y^2/2}^{-y}\, dz\, dy\, dx\)
\(dz\, dx\, dy\text{:}\) \(\ds\int_{-2}^0\int_0^{2}\int_{y^2/2}^{-y}\, dz\, dx\, dy\)
\(dy\, dz\, dx\text{:}\) \(\ds\int_0^2\int_0^{2}\int_{-\sqrt{2z}}^{-z}\, dy\, dz\, dx\)
\(dy\, dx\, dz\text{:}\) \(\ds\int_0^2\int_0^{2}\int_{-\sqrt{2z}}^{-z}\, dy\, dx\, dz\)
\(dx\, dz\, dy\text{:}\) \(\ds\int_{-2}^0\int_{y^2/2}^{-y}\int_0^{2}\, dx\, dz\, dy\)
\(dx\, dy\, dz\text{:}\) \(\ds\int_0^2\int_{-\sqrt{2z}}^{-z}\int_0^{2}\, dx\, dy\, dz\) \(\ds V = \int_0^2\int_0^{2}\int_{-\sqrt{2z}}^{-z}\, dy\, dz\, dx =4/3\text{.}\)
15.6.4.12.
Answer.
\(dz\, dy\, dx\text{:}\) \(\ds\int_0^3\int_{3x}^{9}\int_{0}^{\sqrt{y^2-9x^2}}\, dz\, dy\, dx\)
\(dz\, dx\, dy\text{:}\) \(\ds\int_{0}^9\int_0^{y/3}\int_{0}^{\sqrt{y^2-9x^2}}\, dz\, dx\, dy\)
\(dy\, dz\, dx\text{:}\) \(\ds\int_0^3\int_0^{\sqrt{81-9x^2}}\int_{\sqrt{z^2+9x^2}}^{9}\, dy\, dz\, dx\)
\(dy\, dx\, dz\text{:}\) \(\ds\int_0^9\int_0^{\sqrt{9-z^2/9}}\int_{\sqrt{z^2+9x^2}}^{9}\, dy\, dx\, dz\)
\(dx\, dz\, dy\text{:}\) \(\ds\int_{0}^9\int_{0}^{y}\int_0^{\frac13\sqrt{y^2-z^2}}\, dx\, dz\, dy\)
\(dx\, dy\, dz\text{:}\) \(\ds\int_0^9\int_{z}^{9}\int_0^{\frac13\sqrt{y^2-z^2}}\, dx\, dy\, dz\)
15.6.4.13.
Answer.
\(dz\, dy\, dx\text{:}\) \(\ds\int_0^2\int_{1-x/2}^{1}\int_{0}^{2x+4y-4}\, dz\, dy\, dx\)
\(dz\, dx\, dy\text{:}\) \(\ds\int_{0}^1\int_{2-2y}^{2}\int_{0}^{2x+4y-4}\, dz\, dx\, dy\)
\(dy\, dz\, dx\text{:}\) \(\ds\int_0^2\int_0^{2x}\int_{z/4-x/2+1}^{1}\, dy\, dz\, dx\)
\(dy\, dx\, dz\text{:}\) \(\ds\int_0^4\int_{z/2}^{2}\int_{z/4-x/2+1}^{1}\, dy\, dx\, dz\)
\(dx\, dz\, dy\text{:}\) \(\ds\int_{0}^1\int_{0}^{4y}\int_{z/2-2y+2}^2\, dx\, dz\, dy\)
\(dx\, dy\, dz\text{:}\) \(\ds\int_0^4\int_{z/4}^{1}\int_{z/2-2y+2}^2\, dx\, dy\, dz\) \(\ds V = \int_0^4\int_{z/4}^{1}\int_{z/2-2y-2}^2\, dx\, dy\, dz = 4/3\text{.}\)
15.6.4.14.
Answer.
\(dz\, dy\, dx\text{:}\) \(\ds\int_{-2}^2\int_{0}^{4-x^2}\int_{0}^{2y}\, dz\, dy\, dx\)
\(dz\, dx\, dy\text{:}\) \(\ds\int_{0}^4\int_{-\sqrt{4-y}}^{\sqrt{4-y}}\int_{0}^{2x+4y-4}\, dz\, dx\, dy\)
\(dy\, dz\, dx\text{:}\) \(\ds\int_{-2}^2\int_0^{8-2x^2}\int_{z/2}^{4-x^2}\, dy\, dz\, dx\)
\(dy\, dx\, dz\text{:}\) \(\ds\int_0^8\int_{-\sqrt{4-z/2}}^{\sqrt{4-z/2}}\int_{z/2}^{4-x^2}\, dy\, dx\, dz\)
\(dx\, dz\, dy\text{:}\) \(\ds\int_{0}^4\int_{0}^{2y}\int_{-\sqrt{4-y}}^{\sqrt{4-y}}\, dx\, dz\, dy\)
\(dx\, dy\, dz\text{:}\) \(\ds\int_0^8\int_{z/2}^{4}\int_{-\sqrt{4-y}}^{\sqrt{4-y}}\, dx\, dy\, dz\) \(\ds V = \int_{-2}^2\int_{0}^{4-x^2}\int_{0}^{2y}\, dz\, dy\, dx = 512/15\text{.}\)
15.6.4.15.
Answer.
\(dz\, dy\, dx\text{:}\) \(\ds\int_{0}^1\int_{0}^{1-x^2}\int_{0}^{\sqrt{1-y}}\, dz\, dy\, dx\)
\(dz\, dx\, dy\text{:}\) \(\ds\int_{0}^1\int_{0}^{\sqrt{1-y}}\int_{0}^{\sqrt{1-y}}\, dz\, dx\, dy\)
\(dy\, dz\, dx\text{:}\) \(\ds\int_{0}^1\int_0^{x}\int_{0}^{1-x^2}\, dy\, dz\, dx + \int_{0}^1\int_x^{1}\int_{0}^{1-z^2}\, dy\, dz\, dx\)
\(dy\, dx\, dz\text{:}\) \(\ds\int_0^1\int_{0}^{z}\int_{0}^{1-z^2}\, dy\, dx\, dz+\int_0^1\int_{z}^{1}\int_{0}^{1-x^2}\, dy\, dx\, dz\)
\(dx\, dz\, dy\text{:}\) \(\ds\int_{0}^1\int_{0}^{\sqrt{1-y}}\int_{0}^{\sqrt{1-y}}\, dx\, dz\, dy\)
\(dx\, dy\, dz\text{:}\) \(\ds\int_0^1\int_{0}^{1-z^2}\int_{0}^{\sqrt{1-y}}\, dx\, dy\, dz\) Answers will vary. Neither order is particularly “hard.” The order \(dz\, dy\, dx\) requires integrating a square root, so powers can be messy; the order \(dy\, dz\, dx\) requires two triple integrals, but each uses only polynomials.
15.6.4.16.
Answer.
\(dz\, dy\, dx\text{:}\) \(\ds\int_{0}^1\int_{0}^{3x}\int_{0}^{1-x}\, dz\, dy\, dx+\int_{0}^1\int_{3x}^{3}\int_{0}^{1-y/3}\, dz\, dy\, dx\)
\(dz\, dx\, dy\text{:}\) \(\ds\int_{0}^3\int_{0}^{y/3}\int_{0}^{1-y/3}\, dz\, dy\, dx+\int_{0}^3\int_{y/3}^{1}\int_{0}^{1-x}\, dz\, dx\, dy\)
\(dy\, dz\, dx\text{:}\) \(\ds\int_{0}^1\int_0^{1-x}\int_{0}^{3-3z}\, dy\, dz\, dx\)
\(dy\, dx\, dz\text{:}\) \(\ds\int_0^1\int_{0}^{1-z}\int_{0}^{3-3z}\, dy\, dx\, dz\)
\(dx\, dz\, dy\text{:}\) \(\ds\int_{0}^3\int_{0}^{1-y/3}\int_{0}^{1-z}\, dx\, dz\, dy\)
\(dx\, dy\, dz\text{:}\) \(\ds\int_0^1\int_{0}^{3-3z}\int_{0}^{1-z}\, dx\, dy\, dz\) \(\ds V = \int_0^1\int_{0}^{3-3z}\int_{0}^{1-z}\, dx\, dy\, dz = 1\text{.}\)
15.6.4.18.
Answer.
\(\frac{7}{8}\)
15.6.4.20.
Answer.
\(0\)
15.7 Triple Integration with Cylindrical and Spherical Coordinates
15.7.3 Exercises
Problems
15.7.3.11.
Answer.
\(\ds\int_{\theta_1}^{\theta_2}\int_{r_1}^{r_2}\int_{z_1}^{z_2}h(r,\theta,z)r\, dz\, dr\, d\theta\)
15.7.3.12.
Answer.
\(\ds\int_{\varphi_1}^{\varphi_2}\int_{\theta_1}^{\theta_2}\int_{\rho_1}^{\rho_2}h(\rho,\theta,\varphi)\rho^2\sin(\varphi)\, d\rho\, d\theta\, d\varphi\)
15.7.3.19.
Answer.
Describes the portion of the unit ball that resides in the first octant.
15.7.3.20.
Answer.
Describes half of a spherical shell (i.e., \(y\geq 0\)) with inner radius of \(1\) and outer radius of \(1.1\) centered at the origin.
16 Vector Analysis
16.1 Introduction to Line Integrals
16.1.4 Exercises
Terms and Concepts
16.1.4.1.
Answer.
When \(C\) is a curve in the plane and \(f\) is a function defined over \(C\text{,}\) then \(\int_C f(s)\, ds\) describes the area under the spatial curve that lies on \(f\text{,}\) over \(C\text{.}\)
16.1.4.2.
Answer.
The evaluation is the same. The \(\oint\) notation signifies that the curve \(C\) is a closed curve, though the evaluation is the same.
16.1.4.3.
Answer.
The variable \(s\) denotes the arc-length parameter, which is generally difficult to use. The Key Idea allows one to parametrize a curve using another, ideally easier-to-use, parameter.
16.1.4.4.
Answer.
Answers will vary.
Problems
16.1.4.5.
Answer.
\(12\sqrt{2}\)
16.1.4.6.
Answer.
\(41\sqrt{10}/2\)
16.1.4.7.
Answer.
\(40\pi\)
16.1.4.8.
Answer.
\(10\pi^2\)
16.1.4.9.
Answer.
Over the first subcurve of \(C\text{,}\) the line integral has a value of \(3/2\text{;}\) over the second subcurve, the line integral has a value of \(4/3\text{.}\) The total value of the line integral is thus \(17/6\text{.}\)
16.1.4.10.
Answer.
Over the first subcurve of \(C\text{,}\) the line integral has a value of \(2\sqrt{2}/3\text{;}\) over the second subcurve, the line integral has a value of \(\pi-2\text{.}\) The total value of the line integral is thus \(\pi+2\sqrt{2}/3-2\text{.}\)
16.1.4.11.
Answer.
\(\int_0^1(5t^2+_2t+2)\sqrt{(4t+1)^2+1}\, dt \approx 17.071\)
16.1.4.12.
Answer.
\(\int_0^\pi t\sqrt{1+\cos^2t}\, dt \approx 6.001\)
16.1.4.13.
Answer.
\(\oint_0^{2\pi} \big(10-4\cos^2t-\sin^2t\big)\sqrt{\cos^2t+4\sin^2t}\, dt \approx 74.986\)
16.1.4.14.
Answer.
\(\int_{-1}^{1} \big(3t^3+2t+5\big)\sqrt{9t^4+1}\, dt \approx 15.479\)
16.1.4.15.
Answer.
\(7\sqrt{26}/3\)
16.1.4.16.
Answer.
\(2\pi\)
16.1.4.17.
Answer.
\(8\pi^3\)
16.1.4.18.
Answer.
\(5/2\)
16.1.4.19.
Answer.
\(M=8\sqrt{2}\pi^2\text{;}\) center of mass is \((0,-1/(2\pi), 8\pi/3)\text{.}\)
16.1.4.20.
Answer.
\(M\approx 0.237\text{;}\) center of mass is approximately \((0.173, 0.099,0.065)\text{.}\)
16.2 Vector Fields
16.2.3 Exercises
Terms and Concepts
16.2.3.1.
Answer.
Answers will vary. Appropriate answers include velocities of moving particles (air, water, etc.); gravitational or electromagnetic forces.
16.2.3.2.
Answer.
Specific answers will vary, though should relate to the idea that “more of the vector field is moving into that point than out of that point.”
16.2.3.3.
Answer.
Specific answers will vary, though should relate to the idea that the vector field is spinning clockwise at that point.
16.2.3.4.
Answer.
No; to be incompressible, the divergence needs to be 0 everywhere, not just at one point.
Problems
16.2.3.5.
Answer.
Correct answers should look similar to
16.2.3.6.
Answer.
Correct answers should look similar to
16.2.3.7.
Answer.
Correct answers should look similar to
16.2.3.8.
Answer.
Correct answers should look similar to
16.2.3.9.
Answer.
\(\divv \vec F = 1+2y\)
\(\curl \vec F = 0\)
16.2.3.10.
Answer.
\(\divv \vec F = 0\)
\(\curl \vec F = 1+2y\)
16.2.3.11.
Answer.
\(\divv \vec F = x\cos(xy)-y\sin(xy)\)
\(\curl \vec F = y\cos(xy)+x\sin(xy)\)
16.2.3.12.
Answer.
\(\divv \vec F = \frac{4}{(x^2+y^2)^2}\)
\(\curl \vec F = 0\)
16.2.3.13.
Answer.
\(\divv \vec F = 3\)
\(\curl \vec F = \la -1,-1,-1\ra\)
16.2.3.14.
Answer.
\(\divv \vec F = 2x+2y+2z\)
\(\curl \vec F = \la 2y,2z,2x\ra\)
16.2.3.15.
Answer.
\(\divv \vec F = 1+2y\)
\(\curl\vec F = 0\)
16.2.3.16.
Answer.
\(\divv \vec F = 2y\)
\(\curl\vec F = 0\)
16.2.3.17.
Answer.
\(\divv \vec F = 2y-\sin z\)
\(\curl\vec F = \vec 0\)
16.2.3.18.
Answer.
\(\divv \vec F = \frac{2}{(x^2+y^2+z^2)^2}\)
\(\curl\vec F = \vec 0\)
16.3 Line Integrals over Vector Fields
16.3.4 Exercises
Terms and Concepts
16.3.4.1.
Answer.
False. It is true for line integrals over scalar fields, though.
16.3.4.2.
Answer.
The input of \(\vec F\) should be a point in the plane, not a two dimensional vector.
16.3.4.3.
Answer.
True.
16.3.4.4.
Answer.
False.
16.3.4.5.
Answer.
We can conclude that \(\vec F\) is conservative.
16.3.4.6.
Answer.
By the Fundamental Theorem of Line Integrals, since \(\vec F\) is conservative, \(\oint_C \vec F\cdot d\vec r = f(B) - f(A)\text{,}\) where \(f\) is a potential function for \(\vec F\) and \(A\) and \(B\) are the initial and terminal points of \(C\text{,}\) respectively. Since \(C\) is a closed curve, \(A = B\text{,}\) and hence \(f(B) - f(A) = 0\text{.}\)
Problems
16.3.4.7.
Answer.
\(11/6\text{.}\) (One parametrization for \(C\) is \(\vec r(t) = \langle 3t,t\rangle\) on \(0\leq t\leq 1\text{.}\))
16.3.4.8.
Answer.
\(5/3\text{.}\) (One parametrization for \(C\) is \(\vec r(t) = \langle t,t^2\rangle\) on \(0\leq t\leq 1\text{.}\))
16.3.4.9.
Answer.
\(0\text{.}\) (One parametrization for \(C\) is \(\vec r(t) = \langle \cos t,\sin t\rangle\) on \(0\leq t\leq \pi\text{.}\))
16.3.4.10.
Answer.
\(2/5\text{.}\) (One parametrization for \(C\) is \(\vec r(t) = \langle t,t^3\rangle\) on \(-1\leq t\leq 1\text{.}\))
16.3.4.11.
Answer.
\(12\text{.}\) (One parametrization for \(C\) is \(\vec r(t) = \langle 1,2,3\rangle+t\langle 3,1,-1\rangle\) on \(0\leq t\leq 1\text{.}\))
16.3.4.12.
Answer.
\(1\text{.}\)
16.3.4.13.
Answer.
\(5/6\) joules. (One parametrization for \(C\) is \(\vec r(t) = \langle t,t\rangle\) on \(0\leq t\leq 1\text{.}\))
16.3.4.14.
Answer.
\(13/15\) joules. (One parametrization for \(C\) is \(\vec r(t) = \langle t,\sqrt t\rangle\) on \(0\leq t\leq 1\text{.}\))
16.3.4.15.
Answer.
\(24\) ft-lbs.
16.3.4.16.
Answer.
\(24\) ft-lbs.
16.3.4.17.
Answer.
- \(\displaystyle f(x,y) = xy+x\)
- \(\curl \vec F = 0\text{.}\)
- \(1\text{.}\) (One parametrization for \(C\) is \(\vec r(t) = \langle t,t-1\rangle\) on \(0\leq t\leq 1\text{.}\))
- \(1\) (with \(A = (0,1)\) and \(B = (1,0)\text{,}\) \(f(B) - f(A) = 1\text{.}\))
16.3.4.18.
Answer.
- \(\displaystyle f(x,y) = x^2+xy+y^2\)
- \(\curl \vec F = 0\text{.}\)
- \(0\text{.}\)
- \(0\) (with \(A = (0,0)\) and \(B = (0,0)\text{,}\) \(f(B) - f(A) = 0\text{.}\))
16.3.4.19.
Answer.
- \(\displaystyle f(x,y) = x^2yz\)
- \(\curl \vec F = \vec 0\text{.}\)
- \(250\text{.}\)
- \(250\) (with \(A = (1,-1,0)\) and \(B = (5,5,2)\text{,}\) \(f(B) - f(A) = 250\text{.}\))
16.3.4.20.
Answer.
- \(\displaystyle f(x,y) = x^2+y^2+z^2\)
- \(\curl \vec F = \vec 0\text{.}\)
- \(0\text{.}\)
- \(0\) (with \(A = (1,0,0)\) and \(B = (1,0,0)\text{,}\) \(f(B) - f(A) = 0\text{.}\))
16.4 Flow, Flux, Green’s Theorem and the Divergence Theorem
16.4.4 Exercises
Terms and Concepts
16.4.4.1.
Answer.
along, across
16.4.4.2.
Answer.
It is the measure of flow around the entirety of a closed curve \(C\text{.}\)
16.4.4.3.
Answer.
the curl of \(\vec F\text{,}\) or \(\curl \vec F\)
16.4.4.4.
Answer.
the divergence of \(\vec F\text{,}\) or \(\divv \vec F\)
16.4.4.5.
Answer.
\(\curl \vec F\)
16.4.4.6.
Answer.
\(\divv \vec F\)
Problems
16.4.4.7.
Answer.
\(12\)
16.4.4.8.
Answer.
\(12\)
16.4.4.9.
Answer.
\(-2/3\)
16.4.4.10.
Answer.
\(10/3\)
16.4.4.11.
Answer.
\(1/2\)
16.4.4.12.
Answer.
\(1/2\)
16.4.4.13.
Answer.
The line integral \(\oint_C\vec F\cdot d\vec r\text{,}\) over the parabola, is \(38/3\text{;}\) over the line, it is \(-10\text{.}\) The total line integral is thus \(38/3-10 = 8/3\text{.}\) The double integral of \(\curl \vec F = 2\) over \(R\) also has value \(8/3\text{.}\)
16.4.4.14.
Answer.
Both the line integral and double integral have value of \(2\pi\text{.}\)
16.4.4.15.
Answer.
Three line integrals need to be computed to compute \(\oint_C \vec F\cdot d\vec r\text{.}\) It does not matter which corner one starts from first, but be sure to proceed around the triangle in a counterclockwise fashion.
From \((0,0)\) to \((2,0)\text{,}\) the line integral has a value of 0. From \((2,0)\) to \((1,1)\) the integral has a value of \(7/3\text{.}\) From \((1,1)\) to \((0,0)\) the line integral has a value of \(-1/3\text{.}\) Total value is 2.
The double integral of \(\curl\vec F\) over \(R\) also has value 2.
16.4.4.16.
Answer.
Two line integrals need to be computed to compute \(\oint_C \vec F\cdot d\vec r\text{.}\) Along the parabola, the line integral has value \(25.5\text{.}\) Along the line, the line integral has value \(-21\text{.}\) Together, the total value is \(4.5\)
The double integral of \(\curl\vec F\) over \(R\) also has value \(4.5\text{.}\)
16.4.4.17.
Answer.
Any choice of \(\vec F\) is appropriate as long as \(\curl \vec F = 1\text{.}\) When \(\vec F = \langle -y/2,x/2\rangle\text{,}\) the integrand of the line integral is simply 6. The area of \(R\) is \(12\pi\text{.}\)
16.4.4.18.
Answer.
Any choice of \(\vec F\) is appropriate as long as \(\curl \vec F = 1\text{.}\) The choices of \(\vec F = \langle -y,0\rangle\) and \(\langle 0,x\rangle\) each lead to reasonable integrands. The area of \(R\) is \(4/3\text{.}\)
16.4.4.19.
Answer.
Any choice of \(\vec F\) is appropriate as long as \(\curl \vec F = 1\text{.}\) The choices of \(\vec F = \langle -y,0\rangle\text{,}\) \(\langle 0,x\rangle\) and \(\langle -y/2,x/2\rangle\) each lead to reasonable integrands. The area of \(R\) is \(16/15\text{.}\)
16.4.4.20.
Answer.
Any choice of \(\vec F\) is appropriate as long as \(\curl \vec F = 1\text{.}\) The choice of \(\vec F = \langle -y/2,x/2\rangle\) leads to a reasonable integrand after simplification. The area of \(R\) is \(41\pi/10\text{.}\)
16.4.4.21.
Answer.
The line integral \(\oint_C\vec F\cdot \vec n\, ds\text{,}\) over the parabola, is \(-22/3\text{;}\) over the line, it is \(10\text{.}\) The total line integral is thus \(-22/3+10 = 8/3\text{.}\) The double integral of \(\divv \vec F = 2\) over \(R\) also has value \(8/3\text{.}\)
16.4.4.22.
Answer.
Both the line integral and double integral have value of \(0\text{.}\)
16.4.4.23.
Answer.
Three line integrals need to be computed to compute \(\oint_C \vec F\cdot \vec n\, ds\text{.}\) It does not matter which corner one starts from first, but be sure to proceed around the triangle in a counterclockwise fashion.
From \((0,0)\) to \((2,0)\text{,}\) the line integral has a value of 0. From \((2,0)\) to \((1,1)\) the integral has a value of \(1/3\text{.}\) From \((1,1)\) to \((0,0)\) the line integral has a value of \(1/3\text{.}\) Total value is \(2/3\text{.}\)
The double integral of \(\divv\vec F\) over \(R\) also has value \(2/3\text{.}\)
16.4.4.24.
Answer.
Two line integrals need to be computed to compute \(\oint_C \vec F\cdot \vec n\, ds\text{.}\) Along the parabola, the line integral has value \(159/20\text{.}\) Along the line, the line integral has value \(6\text{.}\) Together, the total value is \(279/20\text{.}\)
The double integral of \(\divv\vec F\) over \(R\) also has value \(279/20\text{.}\)
16.5 Parametrized Surfaces and Surface Area
16.5.3 Exercises
Terms and Concepts
16.5.3.1.
Answer.
Answers will vary, though generally should meaningfully include terms like “two sided”.
16.5.3.2.
Answer.
Many possible answers exist; the one given by the book is the Möbius band.
Problems
16.5.3.3.
Answer.
- \(\vec r(u,v) = \langle u, v, 3u^2v\rangle\) on \(-1\leq u\leq 1\text{,}\) \(0\leq v\leq 2\text{.}\)
- \(\vec r(u,v) = \langle 3v\cos u+1, 3v\sin u+2, 3(3v\cos u+1)^2(3v\sin u+2)\rangle\text{,}\) on \(0\leq u\leq 2\pi\text{,}\) \(0\leq v\leq 1\text{.}\)
- \(\vec r(u,v) = \langle u, v(2-2u), 3u^2v(2-2u)\rangle\) on \(0\leq u, v\leq 1\text{.}\)
- \(\vec r(u,v) = \langle u, v(1-u^2), 3u^2v(1-u^2)\rangle\) on \(-1\leq u\leq 1\text{,}\) \(0\leq v\leq 1\text{.}\)
16.5.3.4.
Answer.
- \(\vec r(u,v) = \langle u, v, 4u+2u^2\rangle\) on \(1\leq u\leq 4\text{,}\) \(5\leq v\leq 7\text{.}\)
- \(\vec r(u,v) = \langle 4v\cos u, 3v\sin u, 16v\cos u+2(3v\sin u)^2\rangle\text{,}\) on \(0\leq u\leq 2\pi\text{,}\) \(0\leq v\leq 1\text{.}\)
- \(\vec r(u,v) = \langle u, u+v(4-2u), 4u+2\big(u+v(4-2u)\big)^2\rangle\) on \(0\leq u\leq 2\text{,}\) \(0\leq v\leq 1\text{.}\)
- \(\vec r(u,v) = \langle v\cos u, v\sin u, 4v\cos u + 2(v\sin u)^2\rangle\) on \(0\leq u\leq 2\pi\text{,}\) \(2\leq v\leq 5\text{.}\)
16.5.3.5.
Answer.
\(\vec r(u,v) = \langle 0, u, v\rangle\) with \(0\leq u\leq 2\text{,}\) \(0\leq v\leq 1\text{.}\)
16.5.3.6.
Answer.
\(\vec r(u,v) = \langle u, 0, 1-u+vu\rangle\) with \(0\leq u\leq 1\text{,}\) \(0\leq v\leq 1\text{.}\)
16.5.3.7.
Answer.
\(\vec r(u,v) = \langle 3\sin u\cos v, 2\sin u\sin v, 4\cos u\rangle\) with \(0\leq u\leq \pi\text{,}\) \(0\leq v\leq 2\pi\text{.}\)
16.5.3.8.
Answer.
Answers may vary; one solution is \(\vec r(u,v) = \langle v\cos u, v, 4v\sin u\rangle\) with \(0\leq u\leq 2\pi\text{,}\) \(-1\leq v\leq 5\text{.}\)
16.5.3.9.
Answer.
Answers may vary.
For \(z = \frac12(3-x)\text{:}\) \(\vec r(u,v) = \langle u, v , \frac12(3-u)\rangle\text{,}\) with \(1\leq u\leq 3\) and \(0\leq v\leq 2\text{.}\)
For \(x=1\text{:}\) \(\vec r(u,v) = \langle 1,u,v\rangle\text{,}\) with \(0\leq u\leq 2\text{,}\) \(0\leq v\leq 1\)
For \(y=0\text{:}\) \(\vec r(u,v) = \langle u,0,v/2(3-u)\rangle\text{,}\) with \(1\leq u\leq 3\text{,}\) \(0\leq v\leq 1\)
For \(y=2\text{:}\) \(\vec r(u,v) = \langle u,2,v/2(3-u)\rangle\text{,}\) with \(1\leq u\leq 3\text{,}\) \(0\leq v\leq 1\)
For \(z=0\text{:}\) \(\vec r(u,v) = \langle u,v,0\rangle\text{,}\) with \(1\leq u\leq 3\text{,}\) \(0\leq v\leq 2\)
16.5.3.10.
Answer.
Answers may vary.
For \(z=2x+4y-4\text{:}\) \(\vec r(u,v) = \langle u, 1-u/2+uv/2, 2u+4(1-u/2+uv/2)-4\rangle\text{,}\) with \(0\leq u\leq 2\text{,}\) \(0\leq v\leq 1\text{.}\)
For \(x=2\text{:}\) \(\vec r(u,v) = \langle 2,u,4uv\rangle\text{,}\) with \(0\leq u\leq 1\text{,}\) \(0\leq v\leq 1\)
For \(y=1\text{:}\) \(\vec r(u,v) = \langle u,1,2uv\rangle\text{,}\) with \(0\leq u\leq 2\text{,}\) \(0\leq v\leq 1\)
For \(z=0\text{:}\) \(\vec r(u,v) = \langle u, 1-u/2+uv/2,0\rangle\text{,}\) with \(0\leq u\leq 2\text{,}\) \(0\leq v\leq 1\)
16.5.3.11.
Answer.
Answers may vary.
For \(z=2y: \vec r(u,v) = \langle u, v(4-u^2), 2v(4-u^2)\rangle\) with \(-2\leq u\leq 2\) and \(0\leq v\leq 1\text{.}\)
For \(y=4-x^2: \vec r(u,v) = \langle u, 4-u^2, 2v(4-u^2)\rangle\) with \(-2\leq u\leq 2\) and \(0\leq v\leq 1\text{.}\)
For \(z=0\text{:}\) \(\vec r(u,v) = \langle u, v(4-u^2), 0\rangle\) with \(-2\leq u\leq 2\) and \(0\leq v\leq 1\text{.}\)
16.5.3.12.
Answer.
Answers may vary.
For \(y=1-z^2\text{:}\) \(\vec r(u,v) = \langle u, v(1-u^2), \sqrt{1-v(1-u^2)}\rangle\) with \(0\leq u\leq 1\) and \(0\leq v\leq 1\text{.}\)
For \(y=1-x^2\text{:}\) \(\vec r(u,v) = \langle u, 1-u^2, uv\rangle\) with \(0\leq u\leq 1\) and \(0\leq v\leq 1\text{.}\)
For \(x=0\text{:}\) \(\vec r(u,v) = \langle 0, v(1-u^2),u\rangle\) with \(0\leq u\leq 1\) and \(0\leq v\leq 1\text{.}\)
For \(y=0\text{:}\) \(\vec r(u,v) = \langle u, 0,v\rangle\) with \(0\leq u\leq 1\) and \(0\leq v\leq 1\text{.}\)
For \(z=0\text{:}\) \(\vec r(u,v) = \langle u, v(1-u^2), 0rangle\) with \(0\leq u\leq 1\) and \(0\leq v\leq 1\text{.}\)
16.5.3.13.
Answer.
Answers may vary.
For \(x^2+y^2/9=1\text{:}\) \(\vec r(u,v) = \langle \cos u, 3\sin u, v\rangle\) with \(0\leq u\leq 2\pi\) and \(1\leq v\leq 3\text{.}\)
For \(z=1\text{:}\) \(\vec r(u,v) = \langle v\cos u, 3v\sin u, 1\rangle\) with \(0\leq u\leq 2\pi\) and \(0\leq v\leq 1\text{.}\)
For \(z=3\text{:}\) \(\vec r(u,v) = \langle v\cos u, 3v\sin u, 3\rangle\) with \(0\leq u\leq 2\pi\) and \(0\leq v\leq 1\text{.}\)
16.5.3.14.
Answer.
Answers may vary.
For \(x^2+y^2=(z-1)^2\text{:}\) \(\vec r(u,v) = \langle v\cos u, v\sin u, 1-v\rangle\) with \(0\leq u\leq 2\pi\) and \(0\leq v\leq 1\text{.}\)
For \(z=0\text{:}\) \(\vec r(u,v) = \langle v\cos u, v\sin u, 0\rangle\) with \(0\leq u\leq 2\pi\) and \(0\leq v\leq 1\text{.}\)
16.5.3.15.
Answer.
Answers may vary.
For \(z=1-x^2\text{:}\) \(\vec r(u,v) = \langle u,v,1-u^2\rangle\) with \(-1\leq u\leq 1\) and \(-1\leq v\leq 2\text{.}\)
For \(y=-1\text{:}\) \(\vec r(u,v) = \langle u,-1,v(1-u^2)\rangle\) with \(-1\leq u\leq 1\) and \(0\leq v\leq 1\text{.}\)
For \(y=2\text{:}\) \(\vec r(u,v) = \langle u,2,v(1-u^2)\rangle\) with \(-1\leq u\leq 1\) and \(0\leq v\leq 1\text{.}\)
For \(z=0\text{:}\) \(\vec r(u,v) = \langle u,v,0\rangle\) with \(-1\leq u\leq 1\) and \(-1\leq v\leq 2\text{.}\)
16.5.3.16.
Answer.
Answers may vary.
For \(z=4-x^2-4y^2\text{:}\) \(\vec r(u,v) = \langle 2v\cos u,v\sin u,4-(2v\cos u)^2-4(v\sin u)^2\rangle\) with \(0\leq u\leq 2\pi\) and \(0\leq v\leq 1\text{.}\)
For \(z=0\text{:}\) \(\vec r(u,v) = \langle 2v\cos u,v\sin u,0\rangle\) with \(0\leq u\leq 2\pi\) and \(0\leq v\leq 1\text{.}\)
16.5.3.17.
Answer.
\(S = 2\sqrt{14}\text{.}\)
16.5.3.18.
Answer.
\(S = \sqrt{6}/2\text{.}\)
16.5.3.19.
Answer.
\(S = 4\sqrt{3}\pi\text{.}\)
16.5.3.20.
Answer.
\(S = 3\sqrt{3}\pi\text{.}\)
16.5.3.21.
Answer.
\(S =\int_0^3\int_0^{2\pi}\sqrt{v^2+4v^4}\, du\, dv= (37\sqrt{37}-1)\pi/6 \approx 117.319\text{.}\)
16.5.3.22.
Answer.
\(S = \int_0^1\int_0^1\sqrt{v^2+4u^2v^2+4v^4}\, du\, dv \approx 0.931\text{.}\)
16.5.3.23.
Answer.
\(S =\int_0^1\int_{-1}^{1}\sqrt{(5u^2-5)^2+2(1-u^2)^2}\, du\, dv = 4\sqrt{3}\approx 6.9282\text{.}\)
16.5.3.24.
Answer.
\(S =\int_0^1\int_{0}^{2\pi}\sqrt{v^2+4v^4}\, du\, dv = (5\sqrt{5}-1)\pi/6 \approx 5.330\text{.}\)
16.6 Surface Integrals
16.6.3 Exercises
Terms and Concepts
16.6.3.1.
Answer.
curve; surface
16.6.3.2.
Answer.
Answers will vary; in general, it means that more of the vector field passes through the surface opposite the direction of the normal vector than in the same direction of the normal vector.
16.6.3.3.
Answer.
outside
16.6.3.4.
Answer.
Problems
16.6.3.5.
Answer.
\(240\sqrt{3}\)
16.6.3.6.
Answer.
\(40\pi\)
16.6.3.7.
Answer.
\(24\)
16.6.3.8.
Answer.
\(15\)
16.6.3.9.
Answer.
\(0\)
16.6.3.10.
Answer.
\(0\)
16.6.3.11.
Answer.
\(-1/2\)
16.6.3.12.
Answer.
\(\pi\)
16.6.3.13.
Answer.
\(0\text{;}\) the flux over \(\surfaceS_1\) is \(-45\pi\) and the flux over \(\surfaceS_2\) is \(45\pi\text{.}\)
16.6.3.14.
Answer.
\(9\pi/8\text{;}\) the flux over \(\surfaceS_1\) is \(3\pi/4\) (use \(\vec r(u,v) = \langle \sin u\cos v,\sin u\sin v,\cos u\rangle\) on \(\pi/3\leq u\leq \pi\text{,}\) \(0\leq v\leq 2\pi\)) and the flux over \(\surfaceS_2\) is \(3\pi/8\) (use \(\vec r(u,v) = \langle v\sqrt{3}\cos (u)/2, v\sqrt{3}\sin(u)/2,1/2\rangle\) for \(0\leq u\leq 2\pi\text{,}\) \(0\leq v\leq 1\text{.}\)
16.7 The Divergence Theorem and Stokes’ Theorem
16.7.4 Exercises
Terms and Concepts
16.7.4.1.
Answer.
Answers will vary; in Section 16.4, the Divergence Theorem connects outward flux over a closed curve in the plane to the divergence of the vector field, whereas in this section the Divergence Theorem connects outward flux over a closed surface in space to the divergence of the vector field.
16.7.4.2.
Answer.
Divergence.
16.7.4.3.
Answer.
Curl.
16.7.4.4.
Answer.
Green’s Theorem.
Problems
16.7.4.5.
Answer.
Outward flux across the plane \(z=2-x/2-2y/3\) is 14; across the plane \(z=0\) the outward flux is \(-8\text{;}\) across the planes \(x=0\) and \(y=0\) the outward flux is 0.
Total outward flux: \(14\text{.}\)
\(\iint_D\divv\vec F\, dV = \int_0^{4}\int_0^{3-3x/4}\int_0^{2-x/2-2y/3}(2x+2y)\, dz\, dy\, dx = 14\text{.}\)
16.7.4.6.
Answer.
Outward flux across the cylinder \(x^2+y^2=1\) is 0; across the plane \(z=3\) the outward flux is \(3\pi\text{;}\) across the plane \(z=-3\) the outward flux is \(3\pi\text{.}\)
Total outward flux: \(6\pi\text{.}\)
\(\iint_D\divv\vec F\, dV = \int_0^{2\pi}\int_0^{1}\int_{-3}^{3}r\, dz\, dr\, d\theta = 6\pi\text{.}\)
16.7.4.7.
Answer.
Outward flux across the surface \(z=xy(3-x)(3-y)\) is 252; across the plane \(z=0\) the outward flux is \(-9\text{.}\)
Total outward flux: \(243\text{.}\)
\(\iint_D\divv\vec F\, dV = \int_0^{3}\int_0^{3}\int_{0}^{xy(3-x)(3-y)}12\, dz\, dy\, dx = 243\text{.}\)
16.7.4.8.
Answer.
Outward flux across the paraboloid is \(112\pi/3\text{;}\) across the disk the outward flux is 0.
Total outward flux: \(112\pi/3\text{.}\)
\(\iint_D\divv\vec F\, dV = \int_0^{2\pi}\int_0^2\int_0^{4-r^2}(2z+2)r\, dz\, dr\, d\theta = 112\pi/3\text{.}\)
16.7.4.9.
Answer.
Circulation on \(C\text{:}\) \(\oint_C \vec F\cdot d\vec r = \pi\)
\(\iint_\surfaceS\big(\curl \vec F\big)\cdot\vec n\, dS = \pi\text{.}\)
16.7.4.10.
Answer.
Circulation on \(C\text{:}\) \(\oint_C \vec F\cdot d\vec r = \pi\)
\(\iint_\surfaceS\big(\curl \vec F\big)\cdot\vec n\, dS = \pi\text{.}\)
16.7.4.11.
Answer.
Circulation on \(C\text{:}\) The flow along the line from \((0,0,2)\) to \((4,0,0)\) is 0; from \((4,0,0)\) to \((0,3,0)\) it is \(-6\text{,}\) and from \((0,3,0)\) to \((0,0,2)\) it is 6. The total circulation is \(0+(-6)+6=0\text{.}\)
\(\iint_\surfaceS\big(\curl \vec F\big)\cdot\vec n\, dS = \iint_\surfaceS 0 \, dS = 0\text{.}\)
16.7.4.12.
Answer.
Circulation on \(C\text{:}\) The flow along the parabola is \(-32/15\text{;}\) the flow along the line is \(4/3\text{.}\) The total circulation is \(4/3-32/15 = -4/5\text{.}\)
\(\iint_\surfaceS\big(\curl \vec F\big)\cdot\vec n\, dS = -4/5\text{.}\)
16.7.4.13.
Answer.
\(128/225\)
16.7.4.14.
Answer.
\(8\)
16.7.4.15.
Answer.
\(8192/105\approx 78.019\)
16.7.4.16.
Answer.
\(64/3\)
16.7.4.17.
Answer.
\(5/3\)
16.7.4.18.
Answer.
\(8\pi\)
16.7.4.19.
Answer.
\(23\pi\)
16.7.4.20.
Answer.
\(0\)
16.7.4.21.
Answer.
Each field has a divergence of 1; by the Divergence Theorem, the total outward flux across \(\surfaceS\) is \(\iint_D 1\, dS\) for each field.
16.7.4.22.
16.7.4.22.a
Answer.
\(\curl\vec F = 1\text{.}\)
16.7.4.22.b
Answer.
\(\curl\vec F\cdot \vec n = 1\text{,}\) where \(\vec n\) is a unit vector normal to \(\surfaceS\text{.}\)
16.7.4.23.
Answer.
Answers will vary. Often the closed surface \(\surfaceS\) is composed of several smooth surfaces. To measure total outward flux, this may require evaluating multiple double integrals. Each double integral requires the parametrization of a surface and the computation of the cross product of partial derivatives. One triple integral may require less work, especially as the divergence of a vector field is generally easy to compute.
16.7.4.24.
Answer.
Answers will vary. Often the closed curve \(C\) is composed of several smooth curves. To measure the total circulation, one may have to evaluate line integrals along each curve. Each line integral requires the parametrization of its curve. It may be less work to evaluate one single double (i.e., surface) integral.
