Exercises 20.5, page 557

1. $\frac{π}{4}, \frac{5 π}{4}$
3. $0, \frac{π}{3}, \frac{5 π}{3}$
5. $\frac{π}{2}$
7. $\frac{π}{3}, \frac{5 π}{3}$
9. $\frac{π}{3}, \frac{2 π}{3}, \frac{4 π}{3}, \frac{5 π}{3}$
11. $0, \frac{π}{6}, \frac{5 π}{6}, π$
13. $\frac{π}{2}, \frac{3 π}{2}$
15. $\frac{π}{4}, \frac{3 π}{4}, \frac{5 π}{4}, \frac{7 π}{4}$
17. 0.2618, 1.309, 3.403, 4.451
19. $0, π$
21. $\frac{3 π}{4} = 2.36, \frac{7 π}{4} = 5.50$
23. 1.9823, 4.3009
25.
$\begin{array}{l} \frac{π}{3} = 1.05, \frac{2 π}{3} = 2.09, \\ \frac{4 π}{3} = 4.19, \frac{5 π}{3} = 5.24 \end{array}$
27.

$\frac{π}{12} = 0.26, \frac{π}{4} = 0.79, \frac{5 π}{12} = 1.31, \frac{3 π}{4} = 2.36, \frac{13 π}{12} = 3.40, \frac{5 π}{4} = 3.93, \frac{17 π}{12} = 4.45, \frac{7 π}{4} = 5.50$
29. $0 = 0.00, \frac{π}{3}$

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