SOLUTION: 2cos2 ∅-2√2cos∅+1=0
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Question 1120627: 2cos2 ∅-2√2cos∅+1=0
Answer by greenestamps(13209) (Show Source): You can put this solution on YOUR website!
The expression is a perfect square trinomial....
x = 45 degrees or 315 degrees, plus or minus any multiple of 360 degrees.
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