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Two plane harmonic sound waves are expre...

Two plane harmonic sound waves are expressed by the equations.
`y_1(x,t)= A cos (pi x - 100 pi t)`
`y_2(x,t) = A cos (0.46 pi x - 92 pi t)`
(All parameters are in MKS)
At x=0 how many times the amplitude of `y_1+y_2` is zero is one second?

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