Images X Y DX

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X y dx. X DX - Y dy = y * x^2 dy - x* y^2 DX. (1+Y)DX=(X-1)dy. Dy/(x+1)DX+XY=0. Dy/y=DX/X-1.
X DX - Y dy = y * x^2 dy - x* y^2 DX. (1+Y)DX=(X-1)dy. Dy/(x+1)DX+XY=0. Dy/y=DX/X-1.

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