\[ \left (x^2-a^2\right ) y''(x)+8 x y'(x)+12 y(x)=0 \] ✓ Mathematica : cpu = 0.0415534 (sec), leaf count = 41
\[\left \{\left \{y(x)\to \frac {c_2 \left (a^2+3 x^2\right )}{3 (a-x)^3 (a+x)^3}+\frac {c_1}{(a+x)^3}\right \}\right \}\] ✓ Maple : cpu = 0.022 (sec), leaf count = 41
\[\left \{y \left (x \right ) = \frac {3 c_{2} a^{2} x +c_{2} x^{3}+c_{1} a^{2}+3 c_{1} x^{2}}{\left (a -x \right )^{3} \left (a +x \right )^{3}}\right \}\]