यदि $\tan^{-1}(1) + \tan^{-1}(3) + \tan^{-1}(5) + \tan^{-1}(1/4) = \pi + \tan^{-1}(\alpha/2)$ है, तो $\alpha$ का मान है... ($/41$ में)

  • A
    $46$
  • B
    $23$
  • C
    $42$
  • D
    $44$

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