त्रिभुज $ABC$ में,$\tan \frac{A}{2} \tan \frac{B}{2} + \tan \frac{B}{2} \tan \frac{C}{2} + \tan \frac{C}{2} \tan \frac{A}{2} =$

  • A
    $0$
  • B
    $1$
  • C
    $\frac{1}{2}$
  • D
    $\pi$

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