## Algebra and Trigonometry 10th Edition

(a) $cos~38.9°=0.7782$ (b) $sec~79.3°=5.3860$
Select the degree (DEG) mode. (a) $cos~38.9°=0.7782$ (b) $sec~79.3°=\frac{1}{cos~79.3°}=5.3860$