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Waves y(1) = Acos(0.5pix - 100pit) and y...

Waves `y_(1) = Acos(0.5pix - 100pit)` and `y_(2)=Acos(0.46pix - 92pit)` are travelling along x-axis. (Here `x` is in `m` and `t` is in second)
(3) The number of times `y_(1) + y_(2) = 0` at `x = 0` in `1sec` is

A

46

B

48

C

192

D

100

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The correct Answer is:
D
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