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A wave representing by the equation y = ...

A wave representing by the equation `y = a cos(kx - omegat)` is superposed with another wave to form a stationary wave such that `x = 0` is a node. The equation for the other wave is

A

`a cos(kx - omega t)`

B

`-a cos(kx - omega t)`

C

`-a cos(kx + omega t)`

D

`-a sin(kx - omega t)`

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