यदि $f(x) = \cot^{-1}\left(\frac{x^x - x^{-x}}{2}\right)$ है,तो $f'(1)$ का मान किसके बराबर है?

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

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