设z=x^2y-xy^2,x=ucosv,y=usinv,求δz/δv ,δz/δu.

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设z=x^2y-xy^2,x=ucosv,y=usinv,求δz/δv,δz/δu.设z=x^2y-xy^2,x=ucosv,y=usinv,求δz/δv,δz/δu.设z=x^2y-xy^2,x=u

设z=x^2y-xy^2,x=ucosv,y=usinv,求δz/δv ,δz/δu.
设z=x^2y-xy^2,x=ucosv,y=usinv,求δz/δv ,δz/δu.

设z=x^2y-xy^2,x=ucosv,y=usinv,求δz/δv ,δz/δu.
δz/δv =δz/δx *δx/δv +δz/δy *δy/δv=(2xy-y^2)(-usinv)+(x^2-2xy)ucosv
δz/δu =δz/δx *δx/δu +δz/δy *δy/δu=(2xy-y^2)cosv+(x^2-2xy)sinv

这是什么啊!???设z=x^2y-xy^2,x=ucosv,y=usinv,求δz/δv ,δz/δu