यदि $\tan ^{-1} a+\tan ^{-1} b+\tan ^{-1} c=\pi$ है,तो निम्नलिखित में से कौन सा सत्य है?

  • A
    $a b c=1$
  • B
    $a+b-c=\frac{a b}{c}$
  • C
    $a+b+c=a b c$
  • D
    $a+b+c=1$

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