यदि $A + B + C = \frac{\pi}{2}$ है,तो $\tan A \tan B + \tan B \tan C + \tan C \tan A$ का मान ज्ञात कीजिए।

  • A
    $0$
  • B
    $\tan A \tan B \tan C$
  • C
    $1$
  • D
    $-1$

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