MCQ
$\mathop {\lim }\limits_{x \to 0} \left[ {\frac{1}{x} - \frac{{\log (1 + x)}}{{{x^2}}}} \right] =$
  • $\frac{1}{2}.$
  • B
    $-1/2$
  • C
    $1$
  • D
    $-1$

Answer

Correct option: A.
$\frac{1}{2}.$
a
(a) Expand $\log \,(1 + x)$ and then solve.

Aliter : Apply $L-$ Hospital’s rule, 

$\mathop {\lim }\limits_{x \to 0} \,\left[ {\frac{{x - \log \,(1 + x)}}{{{x^2}}}} \right]$

$ = \mathop {\lim }\limits_{x \to 0} \frac{{1 - \frac{1}{{1 + x}}}}{{2x}}$

$ = \mathop {\lim }\limits_{x \to 0} \,\,\frac{1}{2}\,{\left( {\frac{1}{{1 + x}}} \right)^2} = \frac{1}{2}.$

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