\( \cos x = \dfrac{{ \sqrt 3 }}{2} \)
A.\(x = \pm \dfrac{\pi }{6} + k2\pi \,\,\left( {k \in \mathbb{Z}} \right)\)
B.\(x = \pm \dfrac{\pi }{3} + k2\pi \,\,\left( {k \in \mathbb{Z} } \right)\)
C.\(x = \pm \dfrac{2\pi }{3} + k2\pi \,\,\left( {k \in \mathbb{Z} } \right)\)
D.\(x = \pm \dfrac{\pi }{6} + 2\pi \,\,\left( {k \in \mathbb{Z} } \right)\)
A.\(x = \pm \dfrac{\pi }{6} + k2\pi \,\,\left( {k \in \mathbb{Z}} \right)\)
B.\(x = \pm \dfrac{\pi }{3} + k2\pi \,\,\left( {k \in \mathbb{Z} } \right)\)
C.\(x = \pm \dfrac{2\pi }{3} + k2\pi \,\,\left( {k \in \mathbb{Z} } \right)\)
D.\(x = \pm \dfrac{\pi }{6} + 2\pi \,\,\left( {k \in \mathbb{Z} } \right)\)
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Hóa Học lớp 12
