### Home > PC > Chapter 4 > Lesson 4.3.2 > Problem 4-139

4-139.

1. Change all terms to sine and cosine.

2. Get a common denominator.

1. Change all terms to sine and cosine.

2. Get a common denominator.

3. Use the Fundamental Pythagorean Identities.

4-139.

1. Change all terms to sine and cosine.

2. Get a common denominator.

1. Change all terms to sine and cosine.

2. Get a common denominator.

3. Use the Fundamental Pythagorean Identities.