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    The phenomenon of beats occurs when two waves of comparable frequency combine. Imagine that two waves of frequencies 285.20Hz and 281.80 Hz combine. Express the sum
    sine 285.20 t plus sine 281.80 tsin285.20t+sin281.80t
    as the product of two trigonometric functions and find the longer time-scale over which the signal varies. Give this time period to 2 decimal places.

    Can anyone help me with how to get the time period for the second part of this question? Thanks
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Updated: October 8, 2017
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