यदि $u = \log(\sqrt{x-1} - \sqrt{x+1})$ और $v = \sqrt{x+1} + \sqrt{x-1}$ है,तो $\frac{du}{dv} = \dots$.

  • A
    $u$
  • B
    $v$
  • C
    $\frac{-1}{u}$
  • D
    $\frac{-1}{v}$

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