### Home > PC > Chapter 4 > Lesson 4.3.1 > Problem 4-125

4-125.

1. Change all terms to sine and cosine.

2. Get a common denominator.

3. Use the Fundamental Pythagorean Identity.

4. Simplify.

Use the Pythagorean Identities.

Change their forms to get 1s.

cos^{2}*θ* + sin^{2}*θ* = 1

1 + tan^{2}*θ* = sec^{2}*θ*

1 + cot^{2}*θ* = csc^{2}*θ*