# 2cos²θ+6cosθ=3

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• February 11th 2009, 01:46 AM
sarabara
2cos²θ+6cosθ=3
thanks for your help!
• February 11th 2009, 02:05 AM
mathaddict
This is the same as one of your previos thread .

First , replace $\cos\theta$with x . After that use the quadratic formula to find x , then solve for $\theta$