Question
Find $\frac{ d y}{ d x}$, if $y =[\log (\log (\log x ))]^2$

Answer

$y=[\log (\log (\log x))]^2$

Differentiating both sides w.r.t. $x$, we get
$ \frac{ d y}{ d x}=\frac{ d }{ d x}[\log (\log (\log x))]^2$
$=2[\log (\log (\log x))] \times \frac{ d }{ d x}[\log (\log (\log x))]$
$=2[\log (\log (\log x))] \times \frac{1}{\log (\log x)} \times \frac{ d }{ d x}[\log (\log x)]$
$=2[\log (\log (\log x))] \times \frac{1}{\log (\log x)} \times \frac{1}{\log x} \times \frac{ d }{ d x}(\log x)$
$=2[\log (\log (\log x))] \times \frac{1}{\log (\log x)} \times \frac{1}{\log x} \times \frac{1}{x}$
$\therefore \frac{ d y}{ d x}=\frac{2[\log (\log (\log x))]}{x(\log x)(\log (\log x))} $

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free