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

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