设f(x，y)=e-xsin(2x+y)，则

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问题设f(x，y)=e^-xsin(2x+y)，则

选项

答案一e^-x[2sin(2x+y)+cos(2x+y)]

解析

[一e^-x.sin(2x+y)+2e^-x.cos(2x+y)]=一e^-x.cos(2x+y)一2e^-x.sin(2x+y)=一e^-x[cos(2x+y)+2sin(2x+y)]．

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高等数学（工本）

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