### Home > CALC > Chapter 4 > Lesson 4.5.1 > Problem 4-164

4-164.

Rewrite the following using a single trigonometric function. You may wish to review your trigonometric identities in Chapter 1.

Double Angle identity (factor first).

Sum and Difference (Angle Sum) identity.

Factor first.

Start by rewriting

and as fractions. You will use more than one identity.