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