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If cos(alpha+beta)=4/5, sin(alpha-beta)=...

If `cos(alpha+beta)=4/5, sin(alpha-beta)=5/13and alpha, beta` between 0 `and (pi)/(4),then tan 2 alpha=`

A

`( 16)/( 63)`

B

`( 56)/( 63)`

C

`( 28)/( 33)`

D

none of these

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The correct Answer is:
B
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