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