SOLUTION: please help me solve this trig question: 2cos2 theta+ cos theta= 1 on the interval 0_< theta< 2 pi find exact answers

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Question 870543: please help me solve this trig question: 2cos2 theta+ cos theta= 1 on the interval 0_< theta< 2 pi find exact answers
Answer by Fombitz(32388)   (Show Source): You can put this solution on YOUR website!
Let .


Two solutions:




and




and

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