Question
$\mathop {\lim }\limits_{x \to a} \frac{{({x^{ - 1}} - {a^{ - 1}})}}{{x - a}} = $
$= \mathop {\lim }\limits_{x \to a} \,\frac{{ - 1}}{{ax}} = \frac{{ - 1}}{{{a^2}}}$
या $\mathop {\lim }\limits_{x \to a} \,\frac{{ - 1/{x^2} - 0}}{{1 - 0}}$
($L-$ हॉस्पीटल नियम से) $ - \frac{1}{{{a^2}}}$
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