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 df(x,y)=cos(xy2)d(xy2)
=cos(xy2)(y2dx+2scydy)
=y2cos(xy2)dx+2xycos(xy2)dy.
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