### Home > PC3 > Chapter 9 > Lesson 9.1.2 > Problem 9-31

9-31.

Simplify each of the following trigonometric expressions.

1. Change all terms to sine and cosine.

2. Get a common denominator for the terms in the parentheses.

3. Use the Fundamental Pythagorean Identity.

1. Multiply out on the left side.

2. Use the Fundamental Pythagorean Identity.