જો $f(x) = \cot^{-1} \left( \frac{x^x - x^{-x}}{2} \right)$ હોય,તો $f'(1)$ ની કિંમત શોધો.

  • A
    $-1$
  • B
    $1$
  • C
    $\log 2$
  • D
    $-\log 2$

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$\frac{d}{dx} \tan^{-1} \left[ \frac{\cos x - \sin x}{\cos x + \sin x} \right] = $

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