If $\alpha + \beta = \frac{\pi }{2}$ and $\beta + \gamma = \alpha ,$ then $\tan \,\alpha $ equals
If $\alpha + \beta = \frac{\pi }{2}$ and $\beta + \gamma = \alpha ,$ then $\tan \,\alpha $ equals
- [IIT 2001]
- A
$2\,(\tan \beta + \tan \gamma )$
- B
$\tan \beta + \tan \gamma $
- C
$\tan \beta + 2\,\tan \gamma $
- D
$2\,\tan \beta + \tan \gamma $
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