\[ \left (4 a^2 x^2+1\right ) y(x)+4 x^2 y''(x)=0 \] ✓ Mathematica : cpu = 0.012896 (sec), leaf count = 28
\[\left \{\left \{y(x)\to \sqrt {x} \left (c_1 J_0(a x)+c_2 Y_0(a x)\right )\right \}\right \}\]
✓ Maple : cpu = 0.066 (sec), leaf count = 23
\[ \left \{ y \left ( x \right ) =\sqrt {x} \left ( {{\sl Y}_{0}\left (ax\right )}{\it \_C2}+{{\sl J}_{0}\left (ax\right )}{\it \_C1} \right ) \right \} \]