\[
\boxed{
{\frac {\rm d}{{\rm d}x}}y \left( x \right) =1/4\,{\frac {-4\,\cos \left( x \right) x+4\,{x}^{2}\sin \left( x \right) +4\,x+4+4\, \left( y \left( x \right)  \right) ^{2}+8\,y \left( x \right) \cos \left( x \right) x-8\,xy \left( x \right) +2\,{x}^{2}\cos \left( 2\,x \right) +6\,{x}^{2}-8\,{x}^{2}\cos \left( x \right) +4\, \left( y \left( x \right)  \right) ^{3}+12\, \left( y \left( x \right)  \right) ^{2}\cos \left( x \right) x-12\,x \left( y \left( x \right)  \right) ^{2}+6\,y \left( x \right) {x}^{2}\cos \left( 2\,x \right) +18\,{x}^{2}y \left( x \right) -24\,y \left( x \right) \cos \left( x \right) {x}^{2}+{x}^{3}\cos \left( 3\,x \right) +15\,{x}^{3}\cos \left( x \right) -6\,{x}^{3}\cos \left( 2\,x \right) -10\,{x}^{3}}{x}}=0}
\]