\[ \left (a+x^2\right ) y'(x)^2+b-2 x y(x) y'(x)+y(x)^2=0 \] ✗ Mathematica : cpu = 3668.57 (sec), leaf count = 0 , timed out
$Aborted
✓ Maple : cpu = 0.835 (sec), leaf count = 78
\[ \left \{ y \left ( x \right ) ={\frac {1}{a}\sqrt {-ab \left ( {x}^{2}+a \right ) }},y \left ( x \right ) =-{\frac {1}{a}\sqrt {-ab \left ( {x}^{2}+a \right ) }},y \left ( x \right ) ={\it \_C1}\,x-\sqrt {-a{{\it \_C1}}^{2}-b},y \left ( x \right ) ={\it \_C1}\,x+\sqrt {-a{{\it \_C1}}^{2}-b} \right \} \]