You are given two waves, a transverse wave that moves to the right f1(x) and a transverse wave that moves to the left f2(x), on a string. As the problem begins, the wave f1(x) is mov-ing to the right at v1 = +1 m/s and the wave f2(x) is moving to the left at v2 = -1 m/s. What is the shape of the wave on the string after 3s?