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Two sinusoidal waves of the same frequency travel in the same direction along a string. If ym1 = 5.9 cm, ym2 = 7.1 cm, 1

Two sinusoidal waves of the same frequency travel in the same direction along a string. If ym1 = 5.9 cm, ym2 = 7.1 cm, φ1 = 0, and φ2 = π/5 rad, what is the amplitude of the resultant wave?

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