Images X Y DX

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X y dx. (Y+X^2)DX=XDY. (Y+1)DX=2xdy. (X+2y)DX-XDY=0. XDY=(X+1) DX.
(Y+X^2)DX=XDY. (Y+1)DX=2xdy. (X+2y)DX-XDY=0. XDY=(X+1) DX.

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