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