\[ y(x) \left (a x^2+(1-v) v\right )+x^2 y''(x)=0 \] ✓ Mathematica : cpu = 0.0214315 (sec), leaf count = 56
DSolve[((1 - v)*v + a*x^2)*y[x] + x^2*Derivative[2][y][x] == 0,y[x],x]
\[\left \{\left \{y(x)\to c_1 \sqrt {x} J_{\frac {1}{2} (2 v-1)}\left (\sqrt {a} x\right )+c_2 \sqrt {x} Y_{\frac {1}{2} (2 v-1)}\left (\sqrt {a} x\right )\right \}\right \}\] ✓ Maple : cpu = 0.031 (sec), leaf count = 31
dsolve(x^2*diff(diff(y(x),x),x)+(a*x^2-v*(v-1))*y(x)=0,y(x))
\[y \left (x \right ) = \sqrt {x}\, \left (\BesselY \left (v -\frac {1}{2}, \sqrt {a}\, x \right ) c_{2}+\BesselJ \left (v -\frac {1}{2}, \sqrt {a}\, x \right ) c_{1}\right )\]