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Three progressive waves A,B and C are sh...

Three progressive waves `A,B` and `C` are shown in figure. With respect to wave `A`
.

A

The wave `C` lags behind in phase by `pi//2` and `B` leads by `pi//2`

B

The wave `C` leads in phase by `pi` and `B` lags behind by `pi`

C

The wave `C` leads in phase by `pi//2` and `B` lags behind by `pi//2`

D

The wave `C` lags behind in phase by `pi` and `B` leads by `pi`

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A
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