Solve 2cos2x + cosx - 1 = 0 for x over the interval [0, 2π).

1.	Solve 2cos2x + cosx - 1 = 0 for x over the interval [0, 2π).
Answer» Solve 2cos²x + cosx - 1 = 0 for x over the interval [0, 2π). Solution:

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