\[
\boxed{
{x}^{2}{\frac {{\rm d}^{2}}{{\rm d}{x}^{2}}}y \left( x \right) -2\,x{\frac {\rm d}{{\rm d}x}}y \left( x \right) + \left( {x}^{2}+2 \right) y \left( x \right) -{\frac {{x}^{3}}{\cos \left( x \right) }}=0}
\]