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If alpha+beta=pi/2\ a n d\ beta+gamma=al...

If `alpha+beta=pi/2\ a n d\ beta+gamma=alpha,` then `t a nalpha,` equals-
a.`2(t a nbeta+t a ngamma)` b. `t a nbeta+t a ngamma` c. `t a nbeta+2t a ngamma` d. `2t a nbeta+t a ngamma`

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