\[ \boxed { \left ( {x}^{2}-1 \right ) {\frac {{\rm d}^{2}}{{\rm d}{x}^{2}}}y \left ( x \right ) -v \left ( v+1 \right ) y \left ( x \right ) =0} \]
Mathematica: cpu = 0.075010 (sec), leaf count = 58 \[ \left \{\left \{y(x)\to c_1 \, _2F_1\left (-\frac {v}{2}-\frac {1}{2},\frac {v}{2};\frac {1}{2};x^2\right )+i c_2 x \, _2F_1\left (\frac {v}{2}+\frac {1}{2},-\frac {v}{2};\frac {3}{2};x^2\right )\right \}\right \} \]
Maple: cpu = 0.047 (sec), leaf count = 57 \[ \left \{ y \left ( x \right ) ={\it \_C1}\, \left ( -{x}^{2}+1 \right ) {\mbox {$_2$F$_1$}(1+{\frac {v}{2}},{\frac {1}{2}}-{\frac {v}{2}};\,{\frac {1}{2}};\,{x}^{2})} +{\it \_C2}\, \left ( -{x}^{3}+x \right ) {\mbox {$_2$F$_1$}(1-{\frac {v}{2}},{\frac {3}{2}}+{\frac {v}{2}};\,{\frac {3}{2}};\,{x}^{2})} \right \} \]