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AlephZero
#2
Jan22-13, 09:31 PM
Engineering
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You can think of a standing wave as the superposition of two travelling waves moving in opposite directions.

For example ##\cos(x - vt)## and ##\cos (x + vt)## are two travelling waves, and their sum is ##\cos(x - vt) + \cos(x + vt) = 2\cos x \cos(vt)## which is a standiing wave.