\begin{array}{1 1}(A)\;\frac{dy}{dx}=\frac{1+y^2}{1+x^2} & (B)\;\frac{dy}{dx}=\frac{1+x^2}{1+y^2}\\(C)\;(1+x^2)dy+(1+y^2)dx=0 & (D)\;(1+x^2)dx+(1+y^2)dy=0\end{array}

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