令z=xy,而x=sin t,y=cos t,求

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问题 令z=xy,而x=sin t,y=cos t,求

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答案[*] =yxy-1.cos t+xylnx.(一sint) =yxy-1cos t—xyln x.sin t =(sint)cost-1cos2t一(sint)1+cost ln sin t.

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