Photos 2 DX DY

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2 dx dy. DX/(X^2-XY+Y^2)=dy/(2y^2-XY). (XY^2+X)DX-(Y-X^2y)dy=0. (Y^2-2xy)DX+X^2dy. (1+У^2)DX=(1+X^2)dy.
DX/(X^2-XY+Y^2)=dy/(2y^2-XY). (XY^2+X)DX-(Y-X^2y)dy=0. (Y^2-2xy)DX+X^2dy. (1+У^2)DX=(1+X^2)dy.

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