If \( f(x)=\log _{x^{2}}(\log x) \), then \( f^{\prime}(x) \) at \(...
If \( f(x)=\log _{x^{2}}(\log x) \), then \( f^{\prime}(x) \) at \( x=e \) is
\( \mathrm{P} \)
(a) 0
(b) 1
(c) \( 1 / e \)
(d) \( 1 / 2 e \)
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