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X y dx. (Y-X)DX+(Y+X)dy=0 решение. (X-Y)DX+(X+Y)dy. Y=dy/DX Y= X=. Y DX- X dy =0.
(Y-X)DX+(Y+X)dy=0 решение. (X-Y)DX+(X+Y)dy. Y=dy/DX Y= X=. Y DX- X dy =0.

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