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3. When two waves with the same amplitude and slightly differing frequencies
are superposed (added), the result can be represented as a wave with
oscillating amplitude. For sound waves, the amplitude is connected to
the loudness, and the result is a sound rising and falling in loudness (this
phenomenon is called "beatings"). Show this happens for the case
4 sin (2420mt) + 4 sin (2360mt)

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