Giải phương trình: \(2{ \cos ^2}x - 3 \cos x + 1 = 0 \, \, \, \, \)
A.\(\left[ \begin{array}{l}x = k2\pi \\x = \pm \frac{\pi }{3} + m2\pi \end{array} \right.\,\,,k,\;m \in \mathbb{Z}\)
B.\(\left[ \begin{array}{l}x = k\pi \\x = \pm \frac{\pi }{3} + m2\pi \end{array} \right.,k,\;m \in \mathbb{Z}\)
C.\(\left[ \begin{array}{l}x = k2\pi \\x = \frac{\pi }{3} + m2\pi \end{array} \right.\,,k,\;m \in \mathbb{Z}\)
D.\(\left[ \begin{array}{l}x = k\pi \\x = \frac{\pi }{3} + m2\pi \end{array} \right.\,,k,\;m \in \mathbb{Z}\)
A.\(\left[ \begin{array}{l}x = k2\pi \\x = \pm \frac{\pi }{3} + m2\pi \end{array} \right.\,\,,k,\;m \in \mathbb{Z}\)
B.\(\left[ \begin{array}{l}x = k\pi \\x = \pm \frac{\pi }{3} + m2\pi \end{array} \right.,k,\;m \in \mathbb{Z}\)
C.\(\left[ \begin{array}{l}x = k2\pi \\x = \frac{\pi }{3} + m2\pi \end{array} \right.\,,k,\;m \in \mathbb{Z}\)
D.\(\left[ \begin{array}{l}x = k\pi \\x = \frac{\pi }{3} + m2\pi \end{array} \right.\,,k,\;m \in \mathbb{Z}\)
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Hóa Học lớp 12
