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OpenStudy (xenesis98):
PLEASE !!!! for a medal Solve 2cos^2x + cosx − 1 = 0 for x over the interval [0, 2 π ). a.π and π/3 b.π, π/3, and 5π/3 c.1 and 2π/3 d.1, 2π/3, and 4π/3 e.1, π/3, and 5π/3
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