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Verify the identity.
cos 4x + cos 2x = 2 - 2 sin2 2x - 2 sin2 x
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Witch sequence shows a pattern where each term is 1.5 times the previous term
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Verify the identity.
cos 4x + cos 2x = 2 - 2 sin2 2x - 2 sin2 x...
cos 4x + cos 2x = 2 - 2 sin2 2x - 2 sin2 x...
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