If $A + B + C = \pi $ and $\cos A = \cos B\,\cos C,$ then $\tan B\,\,\tan C$ is equal to
If $A + B + C = \pi $ and $\cos A = \cos B\,\cos C,$ then $\tan B\,\,\tan C$ is equal to
- A
$\frac{1}{2}$
- B
$2$
- C
$1$
- D
$ - \frac{1}{2}$
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