If f(x)=|log _e|x||, then f'(x) equals

For x > 1, we have

$f(x)=|\log | x||=\log x \Rightarrow f'(x)=\frac{1}{x}$

For x < -1, we have

$f(x)=|\log |x||=\log (-x) \Rightarrow f'(x)=\frac{1}{x}$

For 0 < x < 1, we have

$f(x)=|\log |x||=-\log x \Rightarrow f'(x)=-\frac{1}{x}$

For -1< x < 0, we have

$f(x)=-\log (-x) \Rightarrow f'(x)=-\frac{1}{x}$

Hence, $f'(x)=\left\{\begin{aligned} \frac{1}{x}, & |x|>1 \\ -\frac{1}{x}, & |x|<1\end{aligned}\right.$