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Let cos(alpha+beta) =4/5 and let sin (al...

Let `cos(alpha+beta) =4/5` and let `sin (alpha-beta)=5/13` where `0 le alpha, beta le (pi)/(4)` then `tan 2 alpha`

A

`(25)/(16)`

B

`(56)/(33)`

C

`(19)/(12)`

D

`(20)/(7)`

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The correct Answer is:
B
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