Hi, i'm trying to solve the following PDE in Maple:

>

In the final line, my output is in the form of tau-c*z. How do I switch the tau-c*z back to 

zeta, because I want to integrate T with respect to zeta.

Thank you. 

> restart;
> with(plots); 
> U := V(zeta)*exp(I*(k*tau-w*z));
> zeta := tau-c*z; 
> Uz := diff(U, z);
> Utau := diff(U, tau);
> Utautau := diff(Utau, tau);
> P := convert(U, trig);
> 
> A := abs(P)^2;
> B := evalc(A);