If \( \cos 3 x+\sin \left(2 x-\frac{7 \pi}{6}\right)=-2 \), then \( x \) is equal to \( (k \in Z...
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If \( \cos 3 x+\sin \left(2 x-\frac{7 \pi}{6}\right)=-2 \), then \( x \) is equal to \( (k \in Z) \)
\( \mathrm{P} \)
(1) \( \frac{\pi}{3}(6 k+1) \)
(2) \( \frac{\pi}{3}(6 k-1) \)
(3) \( \frac{\pi}{3}(2 k+1) \)
(4) none of these
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