\[
\boxed{
4\,{\frac {{\rm d}^{2}}{{\rm d}{x}^{2}}}y \left( x \right) +4\, \left( {\frac {\rm d}{{\rm d}x}}y \left( x \right)  \right) \tan \left( x \right) - \left( 5\, \left( \tan \left( x \right)  \right) ^{2}+2 \right) y \left( x \right) =0}
\]