यदि $f(x) = \cos^{-1} \left[ \frac{1 - (\log x)^2}{1 + (\log x)^2} \right]$ है,तो $f'(e) = \_\_\_\_$

  • A
    $1/e$
  • B
    $2/e^2$
  • C
    $2/e$
  • D
    $1$

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