differentiation

Question: If $f(x) = {\cos ^{ - 1}}\left[ {\frac{{1 - {{(\log x)}^2}}}{{1 + {{(\log x)}^2}}}} \right]\,,$then the value of $f'(e) = $



1) 1
2) 1/e
3) 2/e
4) $\frac{2}{{{e^2}}}$
Solution: Explanation: Explanation
standard-differentiation

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