Photos 2 DX DY

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2 dx dy. (Dy)2-2dxdy+(DX)2=0. (XY+X)DX/dy=1. (X^2-3xy)DX-(4+3x^2/2)dy=0. Y/X^2dx-(XY+1)/XDY=0.
(Dy)2-2dxdy+(DX)2=0. (XY+X)DX/dy=1. (X^2-3xy)DX-(4+3x^2/2)dy=0. Y/X^2dx-(XY+1)/XDY=0.

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