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Which two of the given transverse waves ...

Which two of the given transverse waves will give stationary waves when get superimposed
` z_(1) =a cos (kx- omega t) " " .....(A)`
` z_(2) =a cos (kx+ omega t) " " .....(B)`
` z_(3) =a cos (kx- omega t) " " .....(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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