Solve the equation cos(2x) = 1/2 for x in the interval [0, 2π].
π/3, 2π/3, 4π/3, 5π/3
π/12, 5π/12, 7π/12, 11π/12
π/4, 3π/4, 5π/4, 7π/4
π/6, π/2, 5π/6, 3π/2

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