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Dx y. (X^2+Y^2+2x)DX + 2 xydy = 0. (Y+X^2)DX=XDY. X²dy − y²dx = 0. ( X^2+Y^2)DX-2xydy.
(X^2+Y^2+2x)DX + 2 xydy = 0. (Y+X^2)DX=XDY. X²dy − y²dx = 0. ( X^2+Y^2)DX-2xydy.

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