lim _{n rightarrow infty}left[frac{n+1}{n^2+1 | vedclass

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Question

(C) The given limit can be written as: $\lim _{n \rightarrow \infty} \sum_{r=1}^{2n} \frac{n+r}{n^2+r^2} = \lim _{n \rightarrow \infty} \sum_{r=1}^{2n

Vedclass · Accepted Answer

$\operatorname{Tan}^{-1} 2+\frac{1}{2} \log 5$

Vedclass · Answer

(C) The given limit can be written as: $\lim _{n \rightarrow \infty} \sum_{r=1}^{2n} \frac{n+r}{n^2+r^2} = \lim _{n \rightarrow \infty} \sum_{r=1}^{2n} \frac{n(1+r/n)}{n^2(1+(r/n)^2)} = \lim _{n \rightarrow \infty} \frac{1}{n} \sum_{r=1}^{2n} \frac{1+r/n}{1+(r/n)^2}$ This is a Riemann sum of the form $\int_{0}^{2} \frac{1+x}{1+x^2} dx$. Evaluating the integral: $\int_{0}^{2} \frac{1}{1+x^2} dx + \int_{0}^{2} \frac{x}{1+x^2} dx$ $= [\operatorname{Tan}^{-1} x]_{0}^{2} + \frac{1}{2} [\log(1+x^2)]_{0}^{2}$ $= (\operatorname{Tan}^{-1} 2 - 0) + \frac{1}{2} (\log 5 - \log 1)$ $= \operatorname{Tan}^{-1} 2 + \frac{1}{2} \log 5$.

$\lim _{n \rightarrow \infty}\left[\frac{n+1}{n^2+1^2}+\frac{n+2}{n^2+2^2}+\frac{n+3}{n^2+3^2}+\ldots+\frac{n+2 n}{n^2+(2n)^2}\right]=$

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