The value of \( \int_{-1}^{1} \frac{d}{d x}\left(\tan ^{-1} \frac{1}{x}\right) d x \) is (A) \( ...
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0The value of \( \int_{-1}^{1} \frac{d}{d x}\left(\tan ^{-1} \frac{1}{x}\right) d x \) is
(A) \( \pi / 2 \)
(B) \( \pi / 4 \)
(C) \( -\pi / 2 \)
(D) None of these
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