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# Evaluate the limit for the following if exists. $\;\lim\limits_{x \to \infty} \large\frac{\log _{e}x}{x}$

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## 1 Answer

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Toolbox:
• L'Hopital's rule: Let $f$ and $g$ be continous real valued functions defined on the closed interval $[a,b], f,g$ be differentiable on $(a,b)$ and $g'(c) \neq 0$
• Then if $\lim\limits_{x \to c}\; f(x)=0, \lim \limits_{x \to c}\; g(x)=0$ and
• $\lim\limits_{x \to c} \large\frac{f'(x)}{g'(x)}$$=L it follows that • \lim \limits_{x \to c} \large\frac{f(x)}{g(x)}$$=L$
• The conditions for L'Hopital's rule remains unchanged if $\lim\limits_{x \to c} f(x)=\pm \infty$ and $\lim\limits_{x \to c} g(x)=\pm \infty$
• All indeterminate forms can be reduced t $\large\frac{0}{0}$ or $\large\frac{\infty}{\infty}$
Step 1:
$\;\lim\limits_{x \to \infty} \large\frac{\log _{e}x}{x}$ is of the form $\large\frac{\infty}{\infty}$
Step 2:
Applying L'Hopital's rule,
$\;\lim\limits_{x \to \infty} \large\frac{\log _{e}x}{x}$$=\lim \limits_{x \to \infty} \large\frac{\Large\frac{1}{x}}{1}$$=0$

answered Jul 29, 2013 by
edited Jul 29, 2013 by meena.p

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