\(\cos 2x = \dfrac{{\sqrt 3 }}{2}\)
A.\(x = \dfrac{\pi }{{4}} + k\pi \,\,\left( {k \in \mathbb{Z}} \right)\).
B.\(x = \pm \dfrac{\pi }{{6}} + k\pi \,\,\left( {k \in \mathbb{Z}} \right)\).
C.\(x = \dfrac{\pi }{{3}} + k\pi \,\,\left( {k \in \mathbb{Z}} \right)\).
D.\(x = \pm \dfrac{\pi }{{12}} + k\pi \,\,\left( {k \in \mathbb{Z}} \right)\).
A.\(x = \dfrac{\pi }{{4}} + k\pi \,\,\left( {k \in \mathbb{Z}} \right)\).
B.\(x = \pm \dfrac{\pi }{{6}} + k\pi \,\,\left( {k \in \mathbb{Z}} \right)\).
C.\(x = \dfrac{\pi }{{3}} + k\pi \,\,\left( {k \in \mathbb{Z}} \right)\).
D.\(x = \pm \dfrac{\pi }{{12}} + k\pi \,\,\left( {k \in \mathbb{Z}} \right)\).
Loga
Hóa Học lớp 12
