\( \int_{\frac{-\pi}{4}}^{\frac{\pi}{4}} \frac{d x}{1+\cos 2 x} \) ...

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\( \int_{\frac{-\pi}{4}}^{\frac{\pi}{4}} \frac{d x}{1+\cos 2 x} \) is equal to
P
(A) 1
(B) 2
(C) 3
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