$\triangle ABC$ में,$\left(\tan \frac{A}{2}+\tan \frac{B}{2}\right) \tan \frac{C}{2} =$

  • A
    $\frac{2c}{a+b+c}$
  • B
    $\frac{2c}{a+b-c}$
  • C
    $\frac{2c^2}{a^2+b^2+c^2}$
  • D
    $\frac{c}{a+b+c}$

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