I have come back to studying physics after 5 years and I'm doing a course in electromagnetism. I've come to the wave equation and I'm a little rusty. For example, the general solution, A(z,t) = Acos(2*pi*z/L - 2*pi*f*t + phi) I know basically what the terms mean, but I'm unsure how they work together to form the wave, and can't seem to form an intuitive picture in my head. My exam is in 3 weeks, do I need to figure this out quickly. I find it near impossible to move on if I don't understand something like this.