Solve $\cos 3x = 1$ for $0 \le x \le 2 \pi.$  Enter all the solutions, separated by commas.
Question:
Solve $\cos 3x = 1$ for $0 \le x \le 2 \pi.$  Enter all the solutions, separated by commas.
Answer:
Let's think step by step.

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0, \frac{2 \pi}{3}, \frac{4 \pi}{3}, 2 \pi
Solve $\cos 3x = 1$ for $0 \le x \le 2 \pi.$  Enter all the solutions, separated by commas.
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