Photos X Y DX

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X y dx. 2x^2dy=(x^2+y^2)DX. (XY^2+X)DX-(Y-X^2y)dy=0. Dy/DX+Y/X -XY 2. (XY+X)DX/dy=1.
2x^2dy=(x^2+y^2)DX. (XY^2+X)DX-(Y-X^2y)dy=0. Dy/DX+Y/X -XY 2. (XY+X)DX/dy=1.

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