Question
If $y=\tan ^2\left(\log x^3\right)$, find $\frac{d y}{d x}$
$y=[\tan (3 \log x)]^2$
differentiate w.r.t. x both side
$\therefore \frac{d y}{d x}=2[\tan (3 \log x)] \times \sec ^2(3 \log x) \cdot \frac{3}{x}$
$\therefore \frac{d y}{d x}=\frac{6}{x} \tan \left(\log x^3\right) \cdot \sec ^2\left(\log x^3\right)$
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Show that $\overline{A B}+\overline{A E}+\overline{B C}+\overline{D C}+\overline{E D}=2 \overline{A C}$