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