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