Giải phương trình lượng giác: \(\cos 2x + 3\sin x - 2 = 0\).
A.\(S = \left\{ {\dfrac{\pi }{6} + k\pi ;\,\,\dfrac{\pi }{2} + k\pi ;\,\,\dfrac{{5\pi }}{6} + k2\pi ,\,\,k \in \mathbb{Z}} \right\}\)
B.\(S = \left\{ {\pm \dfrac{\pi }{3} + k2\pi ;\,\,\dfrac{{\pi }}{4} + k\pi ,\,\,k \in \mathbb{Z}} \right\}\)
C.\(S = \left\{ {\dfrac{\pi }{3} + k2\pi ;\,\,\dfrac{2\pi }{3} + k2\pi ;\,\,\dfrac{{\pi }}{4} + k\pi ,\,\,k \in \mathbb{Z}} \right\}\)
D.\(S = \left\{ {\dfrac{\pi }{2} + k2\pi ;\,\,\dfrac{\pi }{6} + k2\pi ;\,\,\dfrac{{5\pi }}{6} + k2\pi ,\,\,k \in \mathbb{Z}} \right\}\)
A.\(S = \left\{ {\dfrac{\pi }{6} + k\pi ;\,\,\dfrac{\pi }{2} + k\pi ;\,\,\dfrac{{5\pi }}{6} + k2\pi ,\,\,k \in \mathbb{Z}} \right\}\)
B.\(S = \left\{ {\pm \dfrac{\pi }{3} + k2\pi ;\,\,\dfrac{{\pi }}{4} + k\pi ,\,\,k \in \mathbb{Z}} \right\}\)
C.\(S = \left\{ {\dfrac{\pi }{3} + k2\pi ;\,\,\dfrac{2\pi }{3} + k2\pi ;\,\,\dfrac{{\pi }}{4} + k\pi ,\,\,k \in \mathbb{Z}} \right\}\)
D.\(S = \left\{ {\dfrac{\pi }{2} + k2\pi ;\,\,\dfrac{\pi }{6} + k2\pi ;\,\,\dfrac{{5\pi }}{6} + k2\pi ,\,\,k \in \mathbb{Z}} \right\}\)
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Hóa Học lớp 12
