(4)已知 du(x,y)=(ydx-xdy)/(3x^2)-2xy+3y^(2)，则u(x,y)=____.

(4)已知 $du(x,y)=\frac{ydx-xdy}{3x^{2}-2xy+3y^{2}}$，则u(x,y)=____.

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