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OpenStudy (anonymous):
cos^2A-cos2A=
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OpenStudy (lgbasallote):
cos(2A) = cos^2 A - sin^2 A so cos^2 A - cos(2A) = cos^2 A - (cos^2 A - sin^2 A) cos^2 A - cos^2 a + sin^2 A so the answer is just sin^2 A
OpenStudy (lgbasallote):
*ahem* you there @legacymom ?
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