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OpenStudy (anonymous):
Verify the identity. cos 4x + cos 2x = 2 - 2 sin2 2x - 2 sin2 x
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OpenStudy (cwrw238):
cos 4x + cos 2x = 1 - 2 sin^2 2x + 1 - 2 sIn^2 x = 2 - 2 sin^2 2x - 2 sin^2 x
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