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