જો ત્રિકોણ $ABC$ માં $\angle A = 90^\circ$ હોય,તો $\tan^{-1}\left(\frac{c}{a+b}\right) + \tan^{-1}\left(\frac{b}{a+c}\right) = $

  • A
    $0$
  • B
    $1$
  • C
    $\pi/4$
  • D
    $\pi/6$

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