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OpenStudy (lisa123):
Find all solutions to the equation
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OpenStudy (lisa123):
cos2x + 2 cos x + 1 = 0
OpenStudy (lisa123):
Please help I want to solve this question using the quadratic formula
OpenStudy (lisa123):
Im at this step (cos x)^2 = 2 cosx^2 + cosx +1 =0 cosx = [-1 + sqrt(?)]/?
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