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**[SOLVED] Two waves Interfereing...resulting waves interferes with another wave**

**1. Homework Statement**

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. Homework 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?