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