Let \( S=\left\{\theta \in[-2 \pi, 2 \pi]: 2 \cos ^{2} \theta+3 \sin \theta=0\right\} \). Then t....

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Let \( S=\left\{\theta \in[-2 \pi, 2 \pi]: 2 \cos ^{2} \theta+3 \sin \theta=0\right\} \).
\( \mathrm{P} \)
Then the sum of the elements of \( S \) is:
W.
(1) \( \pi \)
(2) \( \frac{5 \pi}{3} \)
(3) \( \frac{13 \pi}{6} \)
(4) \( 2 \pi \)


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