CPM Homework Help : PC Problem 7-39

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7-39.

Expand and simplify the following trig expressions.

$\left(7 − 5 \cos θ\right)^{2}$
Answer (a):
$49 − 70\cos\left(θ\right) + 25\cos^{2}\left(θ\right)$

$\left(\sin θ + \cos θ\right)^{2}$
Answer (b):
$1 + \sin\left(2θ\right)$

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