Phương trình \(\cos x = \dfrac{1}{2}\) có tập nghiệm là:
A.\(\left\{ {x = \pm \dfrac{\pi }{3} + k2\pi ,\,\,k \in \mathbb{Z}} \right\}\)
B.\(\left\{ {x = \pm \dfrac{\pi }{3} + k\pi ,\,\,k \in \mathbb{Z}} \right\}\)
C.\(\left\{ {x = \pm \dfrac{\pi }{4} + k\pi ,\,\,k \in \mathbb{Z}} \right\}\)
D.\(\left\{ {x = \pm \dfrac{{3\pi }}{4} + k2\pi ,\,\,k \in \mathbb{Z}} \right\}\)
A.\(\left\{ {x = \pm \dfrac{\pi }{3} + k2\pi ,\,\,k \in \mathbb{Z}} \right\}\)
B.\(\left\{ {x = \pm \dfrac{\pi }{3} + k\pi ,\,\,k \in \mathbb{Z}} \right\}\)
C.\(\left\{ {x = \pm \dfrac{\pi }{4} + k\pi ,\,\,k \in \mathbb{Z}} \right\}\)
D.\(\left\{ {x = \pm \dfrac{{3\pi }}{4} + k2\pi ,\,\,k \in \mathbb{Z}} \right\}\)
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Hóa Học lớp 12
