Photos X Y DX

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X y dx. X(Y^2-1)DX+Y(X^2-1)dy=0. Xydy=(y^2+x)DX. (1+Y)DX-(1-X)dy=0. (1+Y)DX=(X-1)dy.
X(Y^2-1)DX+Y(X^2-1)dy=0. Xydy=(y^2+x)DX. (1+Y)DX-(1-X)dy=0. (1+Y)DX=(X-1)dy.

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