\( \sum_{n=1}^{3} \tan ^{-1} \frac{1}{n} \) is equal to (a) 0 (b) \( \pi \) (c) \( \frac{\pi}{2}...

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\( \sum_{n=1}^{3} \tan ^{-1} \frac{1}{n} \) is equal to
(a) 0
(b) \( \pi \)
(c) \( \frac{\pi}{2} \)
(d) none of these
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