Question
If $y=\log _7(\log x)$, then find $\frac{d y}{d x}$.

Answer

(a) : $y=\log _7(\log x)=\frac{\log (\log x)}{\log 7}$
$
\therefore \frac{d y}{d x}=\frac{1}{\log 7} \cdot \frac{1}{\log x} \cdot \frac{1}{x} \Rightarrow \frac{d y}{d x}=\frac{1}{x \log 7 \log x}
$

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