That is quite the general wave-function you have there...
...if my memmory serves me this equation have the solutions:
u1 = f(x-c*t);
u2 = g(x+c*t);
So create some-such functions and plot them with any of matlab's plotting tools. I'd skip the symbolic tools and go straight for functions such as: surf, mesh, pcolor, there are also functions like stackplot, multiwaveplot and others to be found no the file exchange.
HTH
