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