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Find all solutions of the equation in the interval [0, 2pi). 2cos0 + 1 = 0 or 2cos (theta) + 1 = 0 please answer

Find all solutions of the equation in the interval [0, 2pi).

2cos0 + 1 = 0 or 2cos (theta) + 1 = 0

please answer in radians in terms of pi.

If there are multiple solutions please separate them with commas.

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