\( \int \frac{\cos 2 x}{\cos x+\sin x} d x \) is equal to \( \mathr...

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\( \int \frac{\cos 2 x}{\cos x+\sin x} d x \) is equal to
\( \mathrm{P} \)
(A) \( \sin x-\cos x+c \)
(B) \( -\sin x+\cos x+c \)
W
(C) \( \sin x+\cos x+c \)
(D) none of these
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