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X y dx. (XY+X)DX/dy=1.  2  0 2 2 У  XY DX  X dy  .. X dy/DX-X 2+2y 0. Y DX- X dy =0.
(XY+X)DX/dy=1.  2  0 2 2 У  XY DX  X dy  .. X dy/DX-X 2+2y 0. Y DX- X dy =0.

See also