### Home > PC > Chapter 7 > Lesson 7.2.2 > Problem7-55

7-55.

Expand each expression and simplify. Use the Fundamental Pythagorean Identity to help.

$\sin^{2}θ + \cos^{2}θ = 1$

1. $\left(1 − \cosθ\right)^{2} + \left(\sin θ\right)^{2}$

1. $\left(2 \sin θ\right)^{2} + \left(2 \cos θ\right)^{2}$