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OpenStudy (anonymous):
(1+ cos theta) (1-cos theta) = sin^2 theta
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OpenStudy (anonymous):
expanding...\[1 - \cos \theta + \cos \theta -\cos^2 \theta \rightarrow 1 - \cos^2 \theta = \sin^2 \theta \]
OpenStudy (anonymous):
is cos^2 theta + sin \^2 theta the answer?
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