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Let cos(alpha+beta)=4/5a n dl e tsin(alp...

Let `cos(alpha+beta)=4/5a n dl e tsin(alpha-beta)=5/(13),` where `0lt=alpha,betalt=pi/4dot` Then `tan2alpha=` `(56)/(33)` (b) `(19)/(12)` (c) `(20)/7` (d) `(25)/(16)`

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