cos⁴t - sin⁴t = (cos²t - sin²t) (cos²t+sin²t) = cos 2t * 1 = cos 2t
cos 2t = cos 2t
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cos⁴t - sin⁴t = (cos²t - sin²t) (cos²t+sin²t) = cos 2t * 1 = cos 2t
cos 2t = cos 2t