\[
\boxed{
{\frac {{\rm d}^{3}}{{\rm d}{x}^{3}}}y \left( x \right) - \left( 3\,{k}^{2} \left( {\it JacobiSN} \left( z,x \right)  \right) ^{2}+a \right) {\frac {\rm d}{{\rm d}x}}y \left( x \right) + \left( b+c \left( {\it JacobiSN} \left( z,x \right)  \right) ^{2}-3\,{k}^{2}{\it JacobiSN} \left( z,x \right) {\it JacobiCN} \left( z,x \right) {\it JacobiDN} \left( z,x \right)  \right) y \left( x \right) =0}
\]