1. The problem statement, all variables and given/known data Two sinusoidal waves in a string are defined by the functions y1 " (2.00 cm) sin(20.0x # 32.0t) and y2 " (2.00 cm) sin(25.0x # 40.0t) where y1, y2, and x are in centimeters and t is in seconds. (a) What is the phase difference between these two waves at the point x " 5.00 cm at t " 2.00 s? (b) What is the positive x value closest to the origin for which the two phases differ by (& at t " 2.00 s? (This is where the two waves add to zero.) 3. The attempt at a solution My teacher went over this problem and gave us this answer... -5x+16= +3.14 -> X=2.57cm -> choose this answer because it is closest to the origin -5x+16= -3.14 -> X=3.83cm book answer is X=.0584 He mentioned why it was different, but I could not understand what he said... he mumbles a lot... lol.