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Dx y. Sqrt(y^2+1)DX=xydy. (1+Y^2)DX=xydy. (Y^(2)+1)^(1/2)DX=xydy. Sqrt(1+y^2)DX-xydy=0.
Sqrt(y^2+1)DX=xydy. (1+Y^2)DX=xydy. (Y^(2)+1)^(1/2)DX=xydy. Sqrt(1+y^2)DX-xydy=0.

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