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