If \( I=\int_{1}^{2} \frac{d x}{(x+1) \sqrt{x^{2}-1}} \) then \( I ...

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If \( I=\int_{1}^{2} \frac{d x}{(x+1) \sqrt{x^{2}-1}} \) then \( I \) is equal to
(a) 1
(b) \( 1 / 2 \)
(c) \( 1 / \sqrt{2} \)
(d) \( 1 / \sqrt{3} \)
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