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Mathematics 7 Online
OpenStudy (anonymous):

Find all solutions in the interval [0, 2π). cos2x + 2 cos x + 1 = 0

OpenStudy (anonymous):

@midhun.madhu1987 This is the same type of question as before. Can you just check me. I got (pi/4, 7pi/4)

OpenStudy (midhun.madhu1987):

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