Question

How do you solve an equation with 2 trigonometric functions?

Answer 1

Let assume an example of an equation with two trigonometry functions, such as:

${\cos }^2\left(\alpha \right)+\cos \left(\alpha \right)={\sin }^2\left(\alpha \right)$

we can solve this equation by either reference angles or trigonometric identities together with a lot of simple or complex algebra

Hence, we can solve an equation with two trigonometric functions basically by using trigonometric identities.