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lim(xrarroo)(n/(n^2+1^2)+n/(n^2+2^2)+?+n...

`lim_(xrarroo)(n/(n^2+1^2)+n/(n^2+2^2)+?+n/(5n))` is equal to (A) `pi/2` (B) `pi/4` (C) `tan^-1(2)` (D) `tan^-1(3)`

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