Try it do you get the same answer?

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6\cos^2(\theta)+\cos (\theta) -1=0

I solved this equation and got \theta= 71 degrees, 289 degrees, 240 degrees, 120 degrees. :rolleyes:
 
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Yes, I got the same answers.
 
anyone else want to give it a try?
 
Yes! Your answers are correct. :biggrin:
 
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