question archive Verify the identity: cos2x = cos^2 x - sin^2 x cos 2x = 1 - 22 sin^2x
Verify the identity: cos2x = cos^2 x - sin^2 x cos 2x = 1 - 22 sin^2x
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Verify the identity: cos2x = cos^2 x - sin^2 x cos 2x = 1 - 22 sin^2x
