यदि $\tan^{-1}x + \tan^{-1}y + \tan^{-1}z = \pi$ है,तो $x + y + z$ का मान क्या होगा?

  • A
    $xyz$
  • B
    $0$
  • C
    $1$
  • D
    $2xyz$

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$\sin^{-1}x + \sin^{-1}\frac{1}{x} + \cos^{-1}x + \cos^{-1}\frac{1}{x} = $

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