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

Let `cos(alpha+beta)=4/5` and let `sin(alpha-beta)=5/(13),w h e r e0lt=alpha,betalt=pi/4dot` Then `t a n2alpha=` `(56)/(33)` b. `(19)/(12)` c. `(20)/7` d. `(25)/(16)`

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