\[
\boxed{
{\frac {\rm d}{{\rm d}x}}y \left( x \right) =1/2\,{\frac {1}{{x}^{3}} \left( 1+2\,F \left( 1/4\,{\frac {4\,{x}^{2}y \left( x \right) +1}{{x}^{2}}} \right) x \right) }=0}
\]