\( \mathrm{P} \) The value of \( \int_{0}^{\pi / 2} \frac{\cos 2 x}...

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\( \mathrm{P} \)
The value of \( \int_{0}^{\pi / 2} \frac{\cos 2 x}{(\sin x+\cos x)^{2}} d x \) is equal to
W.
(1) 0
(2) \( \frac{\pi}{4} \)
(3) \( \frac{\pi}{2} \)
(4) \( \frac{\pi}{6} \)
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