cos 2 x d x = ∫ 1 + cos 2 x 2 d x = ∫ (1 2 + 1 2 cos 2 x) d x = 1 2 x + 1 4 sin 2 x + C ( C は積分定數) cos 2x = cos^2x – sin^2xcos 2x積分精采文章cos 2 ...
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