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Which two of the given transverse waves ...

Which two of the given transverse waves will give stationary wave when get superimposed?
`z_(1) = a cos (kx-omegat) " "(A)`
`z_(2) = a cos (kx +omegat) " "(B)`
`z_(3) = a cos (ky - omegat) " "(C )`

A

A and B

B

A and C

C

B and C

D

Any two

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The correct Answer is:
A
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