[SOLVED] Two waves Interfereing...resulting waves interferes with another wave 1. The problem statement, all variables and given/known data Two traveling sinusoidal waves given by Y1(x,t) = 3.87 sin (2.00x - 40.0t) and Y2(x,t) = 3.87 sin(2.00x - 40.0t + 120deg.) interfere. The resulting wave interferes with Y3 ( x, t) = 3.87 sin ( 2.00x- 40.0t) 2. Relevant equations 3. The attempt at a solution i am confused...do i add the two first waves together, then add that wave with the third wave? do i need to change my degrees to radians?