यदि $f(x)=\log _{x^2}(\log x)$ है,तो $x=e$ पर $f^{\prime}(x)$ का मान ज्ञात कीजिए।

  • A
    $0$
  • B
    $1$
  • C
    $e^{-1}$
  • D
    $(2 e)^{-1}$

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