CPM Homework Help : PCT Problem 7-55

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7-55.

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

Hint:

$\sin^{2}θ + \cos^{2}θ = 1$

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

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

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