The value of \( \lim _{n \rightarrow \infty} 6 \tan \left\{\sum_{\mathrm{r}=1}^{\mathrm{n}} \tan...

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The value of \( \lim _{n \rightarrow \infty} 6 \tan \left\{\sum_{\mathrm{r}=1}^{\mathrm{n}} \tan ^{-1}\left(\frac{1}{r^{2}+3 r+3}\right)\right\} \) is equal to
(a) 1
(b) 2
(c) 3
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