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

Let `cos(alpha + beta) = 4//5 ` and let `sin ( alpha - beta)= 5//13`, where `0 le alpha, beta lt pi//4`. Then `tan 2 alpha ` is equal to

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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