A \( x=n \pi, n \in \mathbb{Z} \)
B \( x=\frac{\pi}{2}+2 n \pi, n \in \mathbb{Z} \)
C \( x=2 n \pi, n \in \mathbb{Z} \)
D \( x=\frac{3 \pi}{2}+2 n \pi, n \in \mathbb{Z} \)
Correct Answer: Option A
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