Verify the identity.
cos 4x + cos 2x = 2 - 2 sin^2(2x) - 2 sin^2 x...
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Mathematics, 03.01.2020 23:31 LaughterLies
Verify the identity.
cos 4x + cos 2x = 2 - 2 sin^2(2x) - 2 sin^2 x
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