### Home > PC > Chapter 6 > Lesson 6.2.2 > Problem 6-90

6-90.

1. Distribute

2. Change to sine and cosines.

3. Get a common denominator.

4. Simplify.

5. Use a Fundamental Pythagorean Identity.

6-90.

1. Distribute

2. Change to sine and cosines.

3. Get a common denominator.

4. Simplify.

5. Use a Fundamental Pythagorean Identity.