\[ \left (4 a^2 x^2+1\right ) y(x)+4 x^2 y''(x)=0 \] ✓ Mathematica : cpu = 0.0131644 (sec), leaf count = 32
\[\left \{\left \{y(x)\to c_1 \sqrt {x} J_0(a x)+c_2 \sqrt {x} Y_0(a x)\right \}\right \}\]
✓ Maple : cpu = 0.035 (sec), leaf count = 25
\[ \left \{ y \left ( x \right ) ={\it \_C1}\,\sqrt {x}{{\sl J}_{0}\left (ax\right )}+{\it \_C2}\,\sqrt {x}{{\sl Y}_{0}\left (ax\right )} \right \} \]