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