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If the displacement (X) of the medium in...

If the displacement (X) of the medium in the x-direction at a point x due to a wave is given by
`X(x,t)=A cos (kx-wt)+Acos(kx+wt)`, then the wave isa

A

longitudinal progressive wave

B

longitudinal stationary wave

C

transverse progressive wave

D

transverse stationary wave

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