\[
\boxed{
ay \left( x \right) {\frac {{\rm d}^{2}}{{\rm d}{x}^{2}}}y \left( x \right) +b \left( {\frac {\rm d}{{\rm d}x}}y \left( x \right)  \right) ^{2}+{\it c4}\, \left( y \left( x \right)  \right) ^{4}+{\it c3}\, \left( y \left( x \right)  \right) ^{3}+{\it c2}\, \left( y \left( x \right)  \right) ^{2}+{\it c1}\,y \left( x \right) +{\it c0}=0}
\]