设y=y(x)由方程ex+y+cos(xy)=sin3x+2确定,则dy/dx|x=0=________.

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问题 设y=y(x)由方程ex+y+cos(xy)=sin3x+2确定,则dy/dx|x=0=________.

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答案2

解析 当x=0时,由ex+y+cos(xy)=sin3x+2得y=0;ex+y+cos(xy)=sin3x+2两边对x求导得ex+y·(1+dy/dx)-sinxy·(y+xdy/dx)=3cos3x,代入得dy/dx|x=0=2.
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