Nghiệm của phương trình \(2\sin x + 1 = 0\) là:
A. \(\left[ \begin{array}{l}x = \frac{{ - \pi }}{6} + k2\pi \\x = \frac{{7\pi }}{6} + k2\pi \end{array} \right.,\,\,k \in Z\).
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B. \(x = \pm \frac{{2\pi }}{3} + k2\pi ,\,\,k \in Z\).
C.\(x = \pm \frac{\pi }{6} + k2\pi ,\,\,k \in Z\).
D. \(\left[ \begin{array}{l}x = \frac{\pi }{3} + k2\pi \\x = \frac{{2\pi }}{3} + k2\pi \end{array} \right.,\,\,k \in Z\)
A. \(\left[ \begin{array}{l}x = \frac{{ - \pi }}{6} + k2\pi \\x = \frac{{7\pi }}{6} + k2\pi \end{array} \right.,\,\,k \in Z\).
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B. \(x = \pm \frac{{2\pi }}{3} + k2\pi ,\,\,k \in Z\).
C.\(x = \pm \frac{\pi }{6} + k2\pi ,\,\,k \in Z\).
D. \(\left[ \begin{array}{l}x = \frac{\pi }{3} + k2\pi \\x = \frac{{2\pi }}{3} + k2\pi \end{array} \right.,\,\,k \in Z\)
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