when we solve the given ODE

E1 := (diff(phi(xi), xi))^2-a*phi(xi)^2-b*phi(xi)^3-c*phi(xi)^4;

we obtained exponential solutions. we need to find the solution (phi(xi))in trignometric form given in the attach file

fille.mw

Thanks in advance for help.

Thanks dear for reply. kindly suggest which walue of phi i will chose to find another trignomtric solution.fille.mw

Thanks for your reply i tried with this command but i am not getting the required solution.