Mathematics, 26.01.2020 19:31, piyonax

Verify the identity.

cos 4x + cos 2x = 2 - 2 sin2 2x - 2 sin2 x

Answers: 1

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Verify the identity.

cos 4x + cos 2x = 2 - 2 sin2 2x - 2 sin2 x...