### Home > PC3 > Chapter 8 > Lesson 8.2.1 > Problem8-63

8-63.
1. Use the Pythagorean Identity to simplify each trigonometric expression. Homework Help ✎

1. cos2(θ) + sin2(θ)

2. $1-\cos^2(θ)$

3. 1 – cos2(5)

4. 1 – sin2(β)

5. 1 – sin2(3δ)

6. 4 – 4 sin2(3δ)

Review your work from problem 8-47.

Factor out a 4 first.