问题标题:
求u=f(x,xy^2,xysinz)的偏导数半期考题目
问题描述:
求u=f(x,xy^2,xysinz)的偏导数
半期考题目
秦刚回答:
u'(x)=f'(x,xy^2,xysinz)*x';
=f'(x,xy^2,xysinz).
u'(y)=f'(x,xy^2,xysinz)(xy^2)';
=f'(x,xy^2,xysinz)(x*2y)
=2xyf'(x,xy^2,xysinz).
u'(z)=f'(x,xy^2,xysinz)(xysinz)'
=f'(x,xy^2,xysinz)(xycosz)
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