$\lim _{n \rightarrow \infty} \frac{1}{n} \sum_{r=0}^{2 n-1} \frac{n^{2}}{n^{2}+4 r^{2}}$ का मान है:

  • A
    $\frac{1}{2} \tan ^{-1}(2)$
  • B
    $\frac{1}{2} \tan ^{-1}(4)$
  • C
    $\tan ^{-1}(4)$
  • D
    $\frac{1}{4} \tan ^{-1}(4)$

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