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Two waves in one string are described by the wave functions
y1 = 2.90 cos (3.80x - 1.50t)
y2 = 3.90 sin (4.80x - 2.10t)
a) where y and x are in centimeters and t is in seconds. Calculate the superposition of the waves y1 + y2 at the points x = 1.50, t = 1.40. (Remember that the arguments of the trigonometric functions are in radians.)

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