Photos 2 DX DY

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2 dx dy. Dy=DX/X^3. (E^-Y/2-XY)dy-DX. Dy/DX +XY=X. Dy/DX-2xy=3x-2x^3.
Dy=DX/X^3. (E^-Y/2-XY)dy-DX. Dy/DX +XY=X. Dy/DX-2xy=3x-2x^3.

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