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