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Let alpha,betaa n dgamma be some angles...

Let `alpha,betaa n dgamma` be some angles in the first quadrant satisfying `tan(alpha+beta)=(15)/8a n dcos e cgamma=(17)/8,` then which of the following hold(s) good? (a) `alpha+beta+gamma=pi` (b)`cotalpha+tanbeta+tangamma=tanalphatanbetatangamma` (c)`tanalpha+tanbeta+tangamma=tanalphatanbetatangamma` (d)`tanalphatanbeta+tanbetatangamma+tangammatanalpha=1`

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