MCQ
$\mathop {\lim }\limits_{x \to \infty } \,\left( {\frac{n}{{{n^2}\, + {1^2}}} + \frac{n}{{{n^2} + {2^2}}} + \frac{n}{{{n^2} + {3^2}}} + ...\frac{1}{{5n}}} \right)$ =
- A$\frac{\pi }{4}$
- B$tan^{-1}\,\,(3)$
- C$\frac{\pi }{2}$
- ✓$tan^{-1}\,\,(2)$
$\mathop {\lim }\limits_{x \to \infty } \sum\limits_{r = 1}^{2n} {\frac{1}{{\left( {1 + \frac{{{r^2}}}{{{n^2}}}} \right)}}} $ Using $D.I.$ as limit of sum, we get
$ = \int\limits_0^2 {\frac{{dx}}{{1 + {x^2}}} = {{\tan }^{ - 1}}2} $
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