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2、对y偏导 ∂f/∂y=3x³y²
3、fx(1,1)=2,fy(1,1)=3
4、fx(0,1)=[(x+y)×1cos(xy)+e^(x+y)×(-sin(xy)×1)])|[(x,y)=(0,1)]=[(0+1)×1cos(0×1y)+e^(0+1)×(-sin(0×1)×1)])=1-e
fy(1,0)=[(x+y)×1cos(xy)+e^(x+y)×(-sin(xy)×1)+3])|[(x,y)=(1,0)]=4-e
3、fx(1,1)=2,fy(1,1)=3
4、fx(0,1)=[(x+y)×1cos(xy)+e^(x+y)×(-sin(xy)×1)])|[(x,y)=(0,1)]=[(0+1)×1cos(0×1y)+e^(0+1)×(-sin(0×1)×1)])=1-e
fy(1,0)=[(x+y)×1cos(xy)+e^(x+y)×(-sin(xy)×1)+3])|[(x,y)=(1,0)]=4-e
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