Given a wave described by y = cos(21t) sin(4.2 x) – cos(4.2x) sin(21t), where x and t are in meters and seconds. What is the wave speed?

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Given a wave described by y = cos(21t) sin(4.2 x) – cos(4.2x) sin(21t), where x and t are in meters and seconds. What is the wave speed?

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