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OpenStudy (chris215):
Verify the identity. cos 4x + cos 2x = 2 - 2 sin^2 2x - 2 sin^2 x
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OpenStudy (chris215):
cos 4x + cos 2x = 2 - 2 sin^2 2x - 2 sin^2 x cos 4x + cos 2x = 1 + 1 − 2sin^2(2x) − 2sin^2(x) cos 4x + cos 2x = (1 - 2sin^2(2x)) + (1 - 2 sin^2(x) cos 4x + cos 2x = cos 4x + cos 2x is my work correct
OpenStudy (irishboy123):
yes
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