求全微分:z=xcos(x-y)$(acontent)
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求全微分:z=xcos(x-y)$(acontent)求全微分:z=xcos(x-y)$(acontent)求全微分:z=xcos(x-y)$(acontent)z=xcos(x-y)zx=cos(x
求全微分:z=xcos(x-y)$(acontent)
求全微分:z=xcos(x-y)
$(acontent)
求全微分:z=xcos(x-y)$(acontent)
z=xcos(x-y)
zx=cos(x-y)-xsin(x-y)
zy=xsin(x-y)
所以
dz=zxdx+zydy=[cos(x-y)-xsin(x-y)]dx+xsin(x-y)dy
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