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Two sinusoidal waves, identical except for phase, travel in the same direction along a string, producing...

Two sinusoidal waves, identical except for phase, travel in the same direction along a string, producing a net wave y´(x, t) = (1.90 mm) sin(22.0x - 6.80t + 0.940 rad), with x in meters and t in seconds. What are (a) the wavelength λ of the two waves, (b) the phase difference between them, and (c) their amplitude ym?

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