Photos 2 DX DY

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2 dx dy. Dy=(x^2-1)DX. (1+X2)DX+y2dy=0. X^2dy=y^2dx. XDY=(X+1) DX.
Dy=(x^2-1)DX. (1+X2)DX+y2dy=0. X^2dy=y^2dx. XDY=(X+1) DX.

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