यदि $\tanh^{-1}(x+iy) = \frac{1}{2} \tanh^{-1}\left(\frac{2x}{1+x^2+y^2}\right) + \frac{i}{2} \tan^{-1}\left(\frac{2y}{1-x^2-y^2}\right)$,जहाँ $x, y \in \mathbb{R}$,तो $\tanh^{-1}(iy) =$

  • A
    $i \tanh^{-1}(y)$
  • B
    $-i \tanh^{-1}(y)$
  • C
    $i \tan^{-1}(y)$
  • D
    $-i \tan^{-1}(y)$

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