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Two longitudinal waves: s1 = 3cos(11t) & s2 = 3cos(10t) interfere. What is the amplitude of the resulting wave?

Two longitudinal waves: s1 = 3cos(11t) & s2 = 3cos(10t) interfere. What is the amplitude of the resulting wave? Correct Answer 6cos(0.5t)

s = s1+s2 = 2(3)*cos(1/2)t*cos(21/2)t = 6cos(0.5t)cos(10.5t). The term 6cos(0.5t) corresponds to the amplitude.

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