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Two transverse sinusoidal waves combining in a medium are described by the wave functions y1 = 1.00 sin ?(x + 0.500t) y2 = 1.00 sin ?(x - 0.500t) where x, y1, and y2 are in centimeters and t is in seconds. (a) x = 0.220 cm (b) x = 0.700 cm c) x = 1.10 cm