Chapter 6 - 6.2 - Right Triangle Trigonometry - 6.2 Exercises - Page 442: 53

(a) $θ=60°=\frac{\pi}{3}rad$ (b) $θ=45°=\frac{\pi}{4}rad$

Consult the table on page 436: (a) $sec~θ=2$ $\frac{1}{cos~θ}=2$ $cos~θ=\frac{1}{2}$ $θ=60°=\frac{\pi}{3}rad$ (b) $cot~θ=1$ $\frac{1}{tan~θ}=1$ $tan~θ=1$ $θ=45°=\frac{\pi}{4}rad$