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