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OpenStudy (anonymous):
Solve 2cos^2x+cosx-1=0 for x over the interval [0, 2, pi). A. pi and pi/3 B. pi, pi/3, and 5pi/3 C. 1 and 2pi/3 D. 1, 2pi/3, and 4pi/3 E. 1, pi/3, and 5pi/3
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