Photos 2 DX DY

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2 dx dy. X^3dy-y(x^2+y^2)DX=0. X^2dy=y^2dx. (XY^2+X)DX-(Y-X^2y)dy=0. (Y+X^2)DX=XDY.
X^3dy-y(x^2+y^2)DX=0. X^2dy=y^2dx. (XY^2+X)DX-(Y-X^2y)dy=0. (Y+X^2)DX=XDY.

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