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z=f(u,x,y)=sin(u+x+y),其中u=x·x+y·y.z对x的偏导数,f对x的偏导数分别是多少?
人气:161 ℃ 时间:2020-07-02 16:20:41
解答
Dz/Dx = cos(u+x+y)*(Du/Dx+1) = cos(u+x+y)*(2x+1),
Df/Dx = cos(u+x+y).
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