The total number of solutions of \( \cos x=\sqrt{1-\sin 2 x} \) in \( [0,2 \pi] \) is equal to (...

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The total number of solutions of \( \cos x=\sqrt{1-\sin 2 x} \) in \( [0,2 \pi] \) is equal to
(a) 2
(b) 3
(c) 5
(d) None of these
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