જો $u=\tan ^{-1}\left(\frac{\sqrt{1+x^{2}}-1}{x}\right)$ અને $v=\tan ^{-1}\left(\frac{2 x \sqrt{1-x^{2}}}{1-2 x^{2}}\right)$ હોય,તો $x=0$ આગળ $\frac{d u}{d v}$ ની કિંમત શોધો.

  • A
    $\frac{1}{4}$
  • B
    $\frac{1}{8}$
  • C
    $1$
  • D
    $\frac{-1}{8}$

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