Question

If cosθ=−3/4 with π<θ<3π/2 , find the following:
(a) cos (−θ) ,(b) sec(−θ) ,(c) sin(−θ) If cosθ=−3/4 with π<θ<3π/2 , find the following:
(a) cos (−θ) ,(b) sec(−θ) ,(c) sin(−θ) @Mathematics

Answer 1

use the appropriate ratios, making sure to be careful with the signs.
\[\cos(-\theta)=\cos(\theta)=-\frac{3}{4}\] because cosine is even

Answer 2

help me do the sec and sine

Answer 3

the sine becomes what?