设∫0yetdt+∫0xcostdt=xy确定函数y=y(x),则dy/dx=________.

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问题 设∫0yetdt+∫0xcostdt=xy确定函数y=y(x),则dy/dx=________.

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答案[*]

解析0yetdt+∫0xcostdt=xy两边对x求导得
ey(dy/dx)+cosx=y+x(dy/dx),则(dy/dx)=[(y-cosx)/(ey-x)].
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