Question
\begin{aligned}&\int_{0}^{\pi / 2} \frac{\cos 2 x}{\cos x+\sin x} d x \text { equals }\\&\begin{array}{llll}(\text { a })-1 & \text { (b) } 0 & \text { (c) } 1 & \text { (d) } 2\end{array}\end{aligned}
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