\[
\boxed{
 \left( {\frac {\rm d}{{\rm d}x}}y \left( x \right)  \right)  \left( 1+\sin \left( x \right)  \right) \sin \left( y \left( x \right)  \right) +\cos \left( x \right)  \left( \cos \left( y \left( x \right)  \right) -1 \right) =0}
\]