\[ a x^3+\left (x^2-1\right ) x y'(x)-\left (2 x^2-1\right ) y(x)=0 \] ✓ Mathematica : cpu = 0.0218895 (sec), leaf count = 23
\[\left \{\left \{y(x)\to x \left (a+c_1 \sqrt {1-x^2}\right )\right \}\right \}\]
✓ Maple : cpu = 0.021 (sec), leaf count = 20
\[ \left \{ y \left ( x \right ) =x \left ( \sqrt {x-1}\sqrt {1+x}{\it \_C1}+a \right ) \right \} \]