ધારો કે $x \in R$ અને $|x| < 1$. તો $\tanh ^{-1} x=$

  • A
    $\frac{1}{2} \log \left(\frac{1+x}{1-x}\right)$
  • B
    $\frac{1}{2} \log \left(\frac{1-x}{1+x}\right)$
  • C
    $\frac{1}{2} \log \left(x+\sqrt{1-x^2}\right)$
  • D
    $\frac{1}{2} \log \left(x-\sqrt{1-x^2}\right)$

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