@Joe Riel 

Thanks a lot Joe. I was involved in this for about two days ! 

@Carl Love 

ans := w(x) = _C1*exp(-I*(-K*E^3*i^3)^(1/4)*x/(E*i))+
_C2*exp(-(-K*E^3*i^3)^(1/4)*x/(E*i))+
_C3*exp(I*(-K*E^3*i^3)^(1/4)*x/(E*i))+
_C4*exp((-K*E^3*i^3)^(1/4)*x/(E*i))

Hi sir. Thanks for your answer. "ans" is the answer of my ode. I want to depart the different parts which comes after constants (C1,C2,C3,C4). I call these different parts "Z" functions ok ?

So I write it like this ans:=_c1*Z1(x)+_C2*Z2(x)......

Now i want to dissect Z functions and put them in a list like this :

[Z1 Z2 Z3 Z4].

Any solution?