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已知df(x,y)=(x2+2xy-y2)dx+(x2-2xy-y2)dy,求f(x,y).
已知df(x,y)=(x2+2xy-y2)dx+(x2-2xy-y2)dy,求f(x,y).
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題目內容
(請給出正確答案)
已知df(x,y)=(x2+2xy-y2)dx+(x2-2xy-y2)dy,求f(x,y).
答案