Question 1114784
.
Instead of solving problems  (or,  better to say,  in order for solve the problem),

you need to learn basic trigonometry formulas and identities.



See the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/Trigonometry-basics/Compendium-of-Trigonometry-Formulas.lesson>FORMULAS FOR TRIGONOMETRIC FUNCTIONS</A>

in this site, and also all relevant associated lessons to it.