设函数y=y(x)由方程ex+y+cos(xy)=0确定,则dy/dx=________.

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问题 设函数y=y(x)由方程ex+y+cos(xy)=0确定,则dy/dx=________.

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答案[ysin(xy)-ex+y]/[ex+y-xsin(xy)]

解析 方程两边对x求导,得ex+y(1+dy/dx)-sin(xy)(y+xdy/dx)=0,解得dy/dx=[ysin(xy)-ex+y]/[ex+y-xsin(xy)].
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