cos2x = cos²x-sin²x = 1-sin²x-sin²x = 1-2sin²x
cos4t+2sin²2t = 1-2sin²2t+2sin²2t = 1
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cos2x = cos²x-sin²x = 1-sin²x-sin²x = 1-2sin²x
cos4t+2sin²2t = 1-2sin²2t+2sin²2t = 1