We are given the expression $a_n = \frac{\ln(\frac{1}{n})}{\sqrt{2n}}$ and we need to analyze it. The question is implicitly asking about the limit of $a_n$ as $n$ approaches infinity.

AnalysisLimitsL'Hopital's RuleLogarithms
2025/6/6

1. Problem Description

We are given the expression an=ln(1n)2na_n = \frac{\ln(\frac{1}{n})}{\sqrt{2n}} and we need to analyze it. The question is implicitly asking about the limit of ana_n as nn approaches infinity.

2. Solution Steps

We have the expression an=ln(1n)2na_n = \frac{\ln(\frac{1}{n})}{\sqrt{2n}}.
Using the property of logarithms, ln(1n)=ln(1)ln(n)=ln(n)\ln(\frac{1}{n}) = \ln(1) - \ln(n) = -\ln(n).
Therefore, an=ln(n)2na_n = \frac{-\ln(n)}{\sqrt{2n}}.
We want to find the limit of ana_n as nn \to \infty, i.e., limnln(n)2n\lim_{n \to \infty} \frac{-\ln(n)}{\sqrt{2n}}.
We can rewrite this as limnln(n)2n\lim_{n \to \infty} \frac{-\ln(n)}{\sqrt{2} \sqrt{n}}.
This is of the form \frac{-\infty}{\infty}, so we can apply L'Hopital's rule.
Taking the derivative of the numerator with respect to nn, we have ddn(ln(n))=1n\frac{d}{dn}(-\ln(n)) = -\frac{1}{n}.
Taking the derivative of the denominator with respect to nn, we have ddn(2n)=2ddn(n)=212n=22n\frac{d}{dn}(\sqrt{2n}) = \sqrt{2} \frac{d}{dn}(\sqrt{n}) = \sqrt{2} \cdot \frac{1}{2\sqrt{n}} = \frac{\sqrt{2}}{2\sqrt{n}}.
Applying L'Hopital's rule, we get:
limn1n22n=limn1n2n2=limn2n2n=limn22n=limn2n\lim_{n \to \infty} \frac{-\frac{1}{n}}{\frac{\sqrt{2}}{2\sqrt{n}}} = \lim_{n \to \infty} \frac{-1}{n} \cdot \frac{2\sqrt{n}}{\sqrt{2}} = \lim_{n \to \infty} \frac{-2\sqrt{n}}{\sqrt{2}n} = \lim_{n \to \infty} \frac{-2}{\sqrt{2}\sqrt{n}} = \lim_{n \to \infty} \frac{-\sqrt{2}}{\sqrt{n}}.
As nn \to \infty, n\sqrt{n} \to \infty, so 2n0\frac{-\sqrt{2}}{\sqrt{n}} \to 0.
Therefore, the limit is
0.

3. Final Answer

limnan=0\lim_{n \to \infty} a_n = 0

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