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

Let `cos(alpha+beta)""=4/5` and let `sin (alpha+beta)""=5/(13)` where `0lt=alpha,betalt=pi/4` , then `t a n""2alpha=` (1) `(56)/(33)` (2) `(19)/(12)` (3) `(20)/7` (4) `(25)/(16)`

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