Two sinusoidal waves, identical except for phase, travel in the same direction along a string and interfere to produce a resultant wave given by y' (x, t) = (1.5 mm) sin(29x - 4.0t + 0.980 rad), with x in meters and t in seconds. (a) What is the wavelength, λ, of the two waves? m (b) What is the phase difference between them? rad (c) What is their amplitude Y? mm sorry, but i have no idea how to do this problem. any help is greatly appreciated!