Phương trình $cos\left ( \pi cos3x \right )=1$ có nghiệm là

Question

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4 câu trả lời

Answer 1

$x=\frac{\pi }{8}+k\frac{\pi}{4} ,k\in \mathbb{Z}$

Answer 2

$x=\frac{\pi }{4}+k\frac{\pi}{2} ,k\in \mathbb{Z}$

Answer 3

$x=\frac{\pi }{6}+k\frac{\pi}{3} ,k\in \mathbb{Z}$

Answer 4

$x=\frac{\pi }{2}+k\pi ,k\in \mathbb{Z}$