\[ y'(x)=\frac {x^3 \sqrt {x^2+y(x)^2}+y(x)}{x} \] ✓ Mathematica : cpu = 0.131146 (sec), leaf count = 20
\[\left \{\left \{y(x)\to x \sinh \left (\frac {1}{3} \left (x^3+3 c_1\right )\right )\right \}\right \}\] ✓ Maple : cpu = 3.915 (sec), leaf count = 30
\[\left \{-\frac {x^{3}}{3}-c_{1}-\ln \left (x \right )+\ln \left (y \left (x \right )+\sqrt {x^{2}+y \left (x \right )^{2}}\right ) = 0\right \}\]