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If A+B+C=pi\ &sin(A+C/2)=ksinC/2, t h e ...

If `A+B+C=pi\ &sin(A+C/2)=ksinC/2, t h e ntanA/2tanB/2=` a.`(k-1)/(k+1)` b. `(k+1)/(k-1)` c.`k/(k+1)` d. `(k+1)/k`

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