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

  • A
    $\operatorname{Tan}^{-1} 2+\frac{1}{2} \log 3$
  • B
    $\frac{\pi}{4}+\frac{1}{2} \log 3$
  • C
    $\operatorname{Tan}^{-1} 2+\frac{1}{2} \log 5$
  • D
    $\frac{\pi}{4}+\frac{1}{2} \log 5$

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$\int_0^3 (2+x^2) dx = $

योगफल की सीमा के रूप में निम्नलिखित निश्चित समाकल का मान ज्ञात कीजिए: $\int_{a}^{b} x \, dx$

मान लीजिए $\lim _{n \rightarrow \infty} \sum_{r=1}^{n} \left( \frac{n}{\sqrt{n^4+r^4}} - \frac{2 n r^2}{(n^2+r^2) \sqrt{n^4+r^4}} \right) = \frac{\pi}{k}.$ प्रतिलोम त्रिकोणमितीय फलनों के मुख्य मानों का उपयोग करते हुए,$k^2$ का मान ज्ञात कीजिए:

$\lim _{n \rightarrow \infty}\left[\frac{1}{n^2} \sec ^2 \frac{1}{n^2}+\frac{2}{n^2} \sec ^2 \frac{4}{n^2}+\frac{3}{n^2} \sec ^2 \frac{9}{n^2}+\ldots+\frac{n}{n^2} \sec ^2 \frac{n^2}{n^2}\right]=$

$\lim _{n \rightarrow \infty} \frac{1^{77}+2^{77}+\ldots+n^{77}}{n^{78}} = $

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