\[
\boxed{
{\frac {{\rm d}^{5}}{{\rm d}{x}^{5}}}y \left( x \right) +2\,{\frac {{\rm d}^{3}}{{\rm d}{x}^{3}}}y \left( x \right) +{\frac {\rm d}{{\rm d}x}}y \left( x \right) -ax-b\sin \left( x \right) -c\cos \left( x \right) =0}
\]