1. The problem statement, all variables and given/known data Calculate the value of the wave at t = (2, 3, 4, 10) ns 0.4 cos(10^8 * t + (1/3) * y) az 2. Relevant equations N/A 3. The attempt at a solution This is the last part of a problem. I have already found the phase shift of 1/3 and wavelength of 6 pi. I have already been given the solution to time = 10 ns it is -0.1665 The professor noted at time 10 ms y=1. This was not given in the problem. He only put it in the solution How the heck did he find this? I realize that the second term in the equation corresponds to a phase shift but If it is in terms of a variable how do I know what it is at time = anything? Can someone help me figure out how to do this. I can take it from there. This is not for graded homework. I am studying for the final on Monday.