Let $S=\left\{\theta \in[-2 \pi, 2 \pi]: 2 \cos ^{2} \theta+3 \sin \theta=0\right\}$.
Then the sum of the elements of $S$ is
$\frac{13 \pi}{6}$
$\pi$
$2 \pi$
$\frac{5 \pi}{3}$
Correct Option: , 3
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