\( f(x)=\sqrt{1-\sin 2 x} \), then \( f^{\prime}(x) \)
(A) \( -(\cos x+\sin x) \), for \( x \in(...
\( f(x)=\sqrt{1-\sin 2 x} \), then \( f^{\prime}(x) \)
(A) \( -(\cos x+\sin x) \), for \( x \in(\pi / 4, \pi / 2) \)
(B) \( \cos x+\sin x \), for \( x \in(0, \pi / 4) \)
(C) \( -(\cos x+\sin x) \), for \( x \in(0, \pi / 4) \)
(D) \( \cos x-\sin x \), for \( x \in(\pi / 4, \pi / 2) \)
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