设f(x,y)=sin(xy2),则df(x,y)= ______.

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问题 设f(x,y)=sin(xy2),则df(x,y)= ______.

选项

答案y2cos(xy2)dx+2xycos(xy2)dy

解析 本题考查了二元函数的全微分的知识点.
df(x,y)=cos(xy2)d(xy2)
=cos(xy2)(y2dx+2xydy)
=y2cos(xy2)dx+2xycos(xy2)dy.
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