设y=3tanx.sin1/x,求dy|x=1.

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问题 设y=3tanx.sin1/x,求dy|x=1

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答案y’=3tanx.ln3.(tanx)’.sin[*]+3tanx.cos1/x.(1/x)’ =3tanx.ln3.1/cosx2.sin[*]+3tanx.cos1/x.(-1/x2) =3tanx.ln3.1/cos2x.sin[*].3tanx.cos1/x. dy|x=1=y’|x=1dx=3tan1(ln3[*]-cos1)dx.

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