\[ \left (x^2+y(x)^2\right ) y'(x)-y(x)^2=0 \] ✗ Mathematica : cpu = 300.001 (sec), leaf count = 0 , timed out
$Aborted
✓ Maple : cpu = 0.151 (sec), leaf count = 43
\[ \left \{ y \left ( x \right ) ={{\rm e}^{{\frac {2\,\sqrt {3}}{3}{\it RootOf} \left ( -\sqrt {3}x{{\rm e}^{{\it \_C1}}}+3\,\tan \left ( {\it \_Z} \right ) x{{\rm e}^{{\it \_C1}}}+2\,\sqrt {3}{{\rm e}^{2/3\,\sqrt {3}{\it \_Z}}} \right ) }-{\it \_C1}}} \right \} \]