求下列函数一阶偏导数: f(x,y)=e-xsin(x+2y),f’x(0,π/4),f’y(0,π/4);

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问题 求下列函数一阶偏导数:
f(x,y)=e-xsin(x+2y),f’x(0,π/4),f’y(0,π/4);

选项

答案f’x(x,y)=-e-xsin(x+2y)+e-xcos(x+2y),f’y(x,y)=2e-xcos(x+2y),f’x(0,π/4)=-1,f’y(0,π/4)=0.

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