Photos X Y DX

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

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