Practice and Applications

7.

$\begin{array}{l} \sin θ = \frac{4}{5}, \cos θ = \frac{3}{5}, \tan θ = \frac{4}{3}, \cot θ = \frac{3}{4}, \sec θ = \frac{5}{3}, \\ \csc θ = \frac{5}{4} \end{array}$
9.

$\begin{array}{l} \sin θ = - \frac{2}{\sqrt{53}}, \cos θ = \frac{7}{\sqrt{53}}, \tan θ = - \frac{2}{7}, \cot θ = - \frac{7}{2}, \\ \sec θ = \frac{\sqrt{53}}{7}, \csc θ = - \frac{\sqrt{53}}{2} \end{array}$
11. $- \cos 48 °, \tan 14 °$
13. $- \sin 71 °, \sec 15 °$
15. $\frac{2 π}{9}, \frac{17 π}{20}$
17. $\frac{34 π}{15}, - \frac{9 π}{8}$
19. $252 °, 130 °$
21. $12 °, 330 °$
23. $32.1 °$
25. $- 2067 °$
27. 1.78
29. 0.3534
31. $- 11.10$
33. $3 π / 2$
35. $- 5 π / 3$
37. $- 0.539$
39. $- 0.47$
41. $- 1.080$
43. $- 0.0488$
45. $- 1.64$
47. 4.140
49. $- 0.5878$
51. $- 0.8660$
53. 0.5569
55. 1.197
57. $10.30 °, 190.30 °$
59. $118.23 °, 241.77 °$
61. 0.5759, 5.707
63. 4.187, 5.238
65. $227.8 °$
67. $246.78 °$
69. 10.8 in.
71. $3.23 = 185.3 °$
73. 14.2 m
75. ${2120 in.}^{2}$
77. 0
79. $A = \frac{1}{2}$

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Basic Technical Mathematics, 11th Edition by Allyn J. Washington, Richard Evans