જો $y=\log \left(\frac{1+x}{1-x}\right)^{1 / 4}-\frac{1}{2} \tan ^{-1}(x)$ હોય,તો $x=\frac{1}{\sqrt{2}}$ આગળ $\frac{d y}{d x}$ ની કિંમત શોધો.

  • A
    $\frac{-4}{3}$
  • B
    $\frac{4}{3}$
  • C
    $\frac{-2}{3}$
  • D
    $\frac{2}{3}$

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