SOLUTION: 2cos^2 (theta) + cos (theta) = 0

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Question 929375: 2cos^2 (theta) + cos (theta) = 0
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
2cos^2 (theta) + cos (theta) = 0
2cos^2 (theta) = -cos (theta)
cos (theta) = - 1/2
θ = 2π/3, 4π/3
....
(cosx, sinx) Summary Unit Circle
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