\[
\boxed{
\sin \left( x \right) {\frac {\rm d}{{\rm d}x}}y \left( x \right) - \left( y \left( x \right)  \right) ^{2} \left( \sin \left( x \right)  \right) ^{2}+ \left( \cos \left( x \right) -3\,\sin \left( x \right)  \right) y \left( x \right) +4=0}
\]