Giải phương trình lượng giác: \({\sin ^2}x + 3\cos 2x = \dfrac{7}{4}\).
A.\(x = \pm \dfrac{\pi }{3} + k\pi \,\,\,\left( {k \in \mathbb{Z}} \right)\).
B.\(x = \pm \dfrac{\pi }{6} + k\pi \,\,\,\left( {k \in \mathbb{Z}} \right)\).
C.\(x = \pm \dfrac{\pi }{4} + 2k\pi \,\,\,\left( {k \in \mathbb{Z}} \right)\).
D.\(x = \pm \dfrac{\pi }{12} + 2k\pi \,\,\,\left( {k \in \mathbb{Z}} \right)\).
A.\(x = \pm \dfrac{\pi }{3} + k\pi \,\,\,\left( {k \in \mathbb{Z}} \right)\).
B.\(x = \pm \dfrac{\pi }{6} + k\pi \,\,\,\left( {k \in \mathbb{Z}} \right)\).
C.\(x = \pm \dfrac{\pi }{4} + 2k\pi \,\,\,\left( {k \in \mathbb{Z}} \right)\).
D.\(x = \pm \dfrac{\pi }{12} + 2k\pi \,\,\,\left( {k \in \mathbb{Z}} \right)\).
Loga
Hóa Học lớp 12
