Images X Y DX

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X y dx. (Y^2-2xy)DX+X^2dy. (XY^2+X)DX-(Y-X^2y)dy=0. X^2dy=(y^2+XY)DX. (XY+X)DX/dy=1.
(Y^2-2xy)DX+X^2dy. (XY^2+X)DX-(Y-X^2y)dy=0. X^2dy=(y^2+XY)DX. (XY+X)DX/dy=1.

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