If $A + C = B,$ then $\tan A\,\tan B\,\tan C = $

  • A

    $\tan A\,\tan B + \tan \,C$

  • B

    $\tan \,B - \tan \,C - \tan \,A$

  • C

    $\tan A + \tan C - \tan B$

  • D

    $ - \,(\tan A\tan B + \tan C)$

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