The solution set of \( (2 \cos x-1)(3+2 \cos x)=0 \) in the interval \( 0 \leq x \leq 2 r_{i} \)...

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The solution set of \( (2 \cos x-1)(3+2 \cos x)=0 \) in the interval \( 0 \leq x \leq 2 r_{i} \) is
(A) \( \left\{\frac{\pi}{3}\right\} \)
(B) \( \left\{\frac{\pi}{3}, \frac{5 \pi}{3}\right\} \)
(C) \( \left\{\frac{\pi}{3}, \frac{5 \pi}{3}, \cos ^{-1}\left(-\frac{3}{2}\right)\right\} \)
(D) none of these
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