\( \int_{\pi / 4}^{3 \pi / 4} \frac{d x}{1+\cos x} \) is equal to (...

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\( \int_{\pi / 4}^{3 \pi / 4} \frac{d x}{1+\cos x} \) is equal to
(1999, 2M)
\( \mathrm{P} \)
(a) 2
(b) \( -2 \)
(c) \( \frac{1}{2} \)
(d) \( -\frac{1}{2} \)
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