यदि $2 \sinh^{-1}\left(\frac{a}{\sqrt{1-a^2}}\right)=\log \left(\frac{1+x}{1-x}\right)$ है, तो $x$ का मान ज्ञात कीजिए।

  • A
    $a$
  • B
    $\frac{1}{a}$
  • C
    $\sqrt{1-a^2}$
  • D
    $\frac{1}{\sqrt{1-a^2}}$

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