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

  • A
    $-1$
  • B
    $\log_{e} 2$
  • C
    $-\log_{e} 2$
  • D
    $3$

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