Photos X Y DX

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X y dx. X(Y^2-1)DX+Y(X^2-1)dy=0. (X+4)dy = (y+1)DX. 2x√1-y2 DX+Y dy=0. (1+Y^2)DX=(1+X^2)dy.
X(Y^2-1)DX+Y(X^2-1)dy=0. (X+4)dy = (y+1)DX. 2x√1-y2 DX+Y dy=0. (1+Y^2)DX=(1+X^2)dy.

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