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同角的余弦和正割成倒數(有意義的前提下) ∴函數公式cos2x的倒數是sec2x 如果是導數,則(cos2x)'=(-sin2x)*(2x)'=-2sin2x
cos2x=cos²;x-sin²;x=2cos²;x-1=1-2sin²;x sin2x=2sinxcosx tan2x=2tanx/(1-tan²;x)
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