Question
$\frac{d}{{dx}}\log |x|{\rm{ }} = ......,(x \ne 0)$
अत: $\frac{d}{{dx}}\left\{ {\log |x|} \right\} = \frac{1}{x}$, यदि $x > 0$
$ = \left( {\frac{1}{{ - x}}} \right)( - 1) = \frac{1}{x}$, यदि $x < 0$
इस प्रकार, $\frac{d}{{dx}}\left\{ {\log |x|} \right\} = \frac{1}{x}$, यदि $x \ne 0$.
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