मान लीजिए $S_{k} = \sum_{r=1}^{k} \tan^{-1}\left(\frac{6^{r}}{2^{2r+1} + 3^{2r+1}}\right)$. तो $\lim_{k \rightarrow \infty} S_{k}$ का मान ज्ञात कीजिए।

  • 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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यदि $-1 < x < 1$ और $x \neq 0$ के लिए $\tan ^{-1}\left(\frac{2 x}{1-x^2}\right)+\cot ^{-1}\left(\frac{1-x^2}{2 x}\right)=\frac{\pi}{3}$ के सभी हलों का योग $\alpha-\frac{4}{\sqrt{3}}$ है,तो $\alpha$ का मान $..........$ है।

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