\( \sqrt 3 \sin x - \cos x + 2 = 0 \);
A.\(x = - \dfrac{\pi }{2} + k2\pi \,\,\,\left( {k \in Z} \right)\)
B.\(x = \dfrac{\pi }{3} + k2\pi \,\,\,\left( {k \in Z} \right)\)
C.\(x = - \dfrac{\pi }{3} + k2\pi \,\,\,\left( {k \in Z} \right)\)
D.\(x = \dfrac{\pi }{2} + k2\pi \,\,\,\left( {k \in Z} \right)\)
A.\(x = - \dfrac{\pi }{2} + k2\pi \,\,\,\left( {k \in Z} \right)\)
B.\(x = \dfrac{\pi }{3} + k2\pi \,\,\,\left( {k \in Z} \right)\)
C.\(x = - \dfrac{\pi }{3} + k2\pi \,\,\,\left( {k \in Z} \right)\)
D.\(x = \dfrac{\pi }{2} + k2\pi \,\,\,\left( {k \in Z} \right)\)
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Hóa Học lớp 12
