Two waves on a string are given by the following functions: y(X, 1) = 4 cos(201 - 30x) (cm) 72(x, 1) = -4 cos(201 + 30x) (cm) where x is in centimeters. The waves are said to interfere constructively when their superposition |ys| = |y1 + y2 maximum, and they interfere destructively when [ys is a minimum. (a) What are the directions of propagation of waves y1 (x.f) and 72(x, t)? (b) At t= (= (17/50) s. at what x location y do the two waves interfere constructively, and what is the corresponding value of|ys|? C) Att = (17/50) s. at what locationx do the two waves interfere destructively, and what is the corresponding value of lys? Use Matlab or Desmos to plot |y1 + y2|