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Dx y. YDX-XDY/(X^2+Y^2). Dy/DX= Y-X^2. (Y-X)DX+(Y+X)dy=0 решение. DX/X^2-A^2.
YDX-XDY/(X^2+Y^2). Dy/DX= Y-X^2. (Y-X)DX+(Y+X)dy=0 решение. DX/X^2-A^2.

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