यदि $a < 1$ और $2 \operatorname{Sinh}^{-1}\left(\frac{a}{\sqrt{1-a^2}}\right)=\log \left(\frac{1+x}{1-x}\right)$ है,तो $x=$

  • A
    $2a$
  • B
    $3a$
  • C
    $4a$
  • D
    $a$

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