\[ -\left (a x^2+12 a+4\right ) \cos (x)+x^2 y''(x)-2 x y'(x)-4 y(x)-x \sin (x)=0 \] ✓ Mathematica : cpu = 0.190055 (sec), leaf count = 33
\[\left \{\left \{y(x)\to \frac {-(2 a+1) \sin (x)-a x \cos (x)+c_2 x^5+c_1}{x}\right \}\right \}\]
✓ Maple : cpu = 0.06 (sec), leaf count = 29
\[ \left \{ y \left ( x \right ) ={\frac { \left ( -2\,a-1 \right ) \sin \left ( x \right ) +{x}^{5}{\it \_C2}-ax\cos \left ( x \right ) +{\it \_C1}}{x}} \right \} \]