If $A+B+C=180^{\circ},$ then $\tan \left(\frac{A+B}{2}\right)=$ ...........

  • A
    $\cot \left(\frac{A+B}{2}\right)$
  • B
    $\cot \frac{C}{2}$
  • C
    $\sec \frac{C}{2}$
  • D
    $\sin \frac{A}{2}$

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