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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

`21/16`

B

`63/52`

C

`33/52`

D

`63/16`

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