100 POINTS AND BRAINLIEST!! PRE CALC! Solve cos x = cos 2x on the domain 0 < x ≤ 2π.

a. 2π/3, 4π/3, 2π
b. π/3, 5π/3, 2π
c. 0, π/3, 5π/3
d. 0, 2π/3, 4π/3

Please explain your answer :)

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