Which sum or difference identity would you use to verify that cos (180° - q) = -cos q?

Step-by-step explanation:

 Given :

We have to write which identity we will use to prove the given statement.

Consider

Take left hand side of given expression

We know

Comparing , we get, a= 180° and b = q

Substitute , we get,

Also, we know and

Substitute, we get,

Simplify , we get,

Hence, use difference identity to  prove the given result.

true !

step-by-step explanation:

your answer is the frist one

hop i