\(\cos 2x + \sin x + 2 = 0\)
A.\(x = - \frac{\pi }{2} + k2\pi \,\,\left( {k \in \mathbb{Z}} \right)\).
B.\(x = - \frac{\pi }{2} + k\pi \,\,\left( {k \in \mathbb{Z}} \right)\).
C.\(x = \frac{\pi }{3} + k2\pi \,\,\left( {k \in \mathbb{Z}} \right)\).
D.\(x = - \frac{\pi }{4} + k2\pi \,\,\left( {k \in \mathbb{Z}} \right)\).
A.\(x = - \frac{\pi }{2} + k2\pi \,\,\left( {k \in \mathbb{Z}} \right)\).
B.\(x = - \frac{\pi }{2} + k\pi \,\,\left( {k \in \mathbb{Z}} \right)\).
C.\(x = \frac{\pi }{3} + k2\pi \,\,\left( {k \in \mathbb{Z}} \right)\).
D.\(x = - \frac{\pi }{4} + k2\pi \,\,\left( {k \in \mathbb{Z}} \right)\).
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Hóa Học lớp 12
