Just need to check to see if I am understanding this problem, ?=2sin(?/2 t+ ?/4). Please correct me if I'm wrong, but the 2 should be the Amplitude and pie over 2 is the length of the wave, and pie over 4 is the phase shift to the left. So instead of the wave going from (0,0) through pie over 2, my graph of the wave is from -pie over 4 to pie over 4. Am I anywhere close on this one?