\[ \left (x^2+1\right ) x y'(x)+x^2 y(x)=0 \] ✓ Mathematica : cpu = 0.0177874 (sec), leaf count = 17
\[\left \{\left \{y(x)\to \frac {c_1}{\sqrt {x^2+1}}\right \}\right \}\] ✓ Maple : cpu = 0.005 (sec), leaf count = 13
\[y \relax (x ) = \frac {c_{1}}{\sqrt {x^{2}+1}}\]