设z=arctany2/2,则dz=________.

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问题 设z=arctany2/2,则dz=________.

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答案-y2/(x2+y4)+2xy/(x2+y4)dy

解析 dz/dx=(-y2/x2)/(1+y4/x2)=-y2/(x2+y4),dz/dy=(2y/x)/(1+y4/x2)=2xy/(x2+y4),则dz=-y2/(x2+y4)+2xy/(x2+y4)dy.
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