જો $A + B + C = \pi$ હોય,તો $\tan^2 \frac{A}{2} + \tan^2 \frac{B}{2} + \tan^2 \frac{C}{2}$ હંમેશા કેટલા થાય?

  • A
    $\le 1$
  • B
    $\ge 1$
  • C
    $= 0$
  • D
    $= 1$

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