ધારો કે $S_{k} = \sum_{r=1}^{k} \tan^{-1}\left(\frac{6^{r}}{2^{2r+1} + 3^{2r+1}}\right)$. તો $\lim_{k \rightarrow \infty} S_{k}$ ની કિંમત શોધો.

  • A
    $\tan^{-1}\left(\frac{3}{2}\right)$
  • B
    $\frac{\pi}{2}$
  • C
    $\cot^{-1}\left(\frac{3}{2}\right)$
  • D
    $\tan^{-1}(3)$

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