simplify the expression, cos(90° - θ) I am not sure what to do

Mathematics · High School · Tue Nov 03 2020

Answered on

Here, we have to solve for cos(90° - θ).

cos(90° - θ) = sinθ

Since, 90 - θ lies in 1st quadrant where every trigonometric function is positive. 

And, trigonometric function changes when angle is either 90° or 270°.