Photos X Y DX

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X y dx. X^2dy=y^2dx. X²dy − y²dx = 0. 2x(1-y2)DX-2y(1-x2)dy=0. (X+Y+1)DX=(2x+2y-1)dy.
X^2dy=y^2dx. X²dy − y²dx = 0. 2x(1-y2)DX-2y(1-x2)dy=0. (X+Y+1)DX=(2x+2y-1)dy.

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