SOLUTION: Find all solutions: 2cos(x)+1=0

Question 304442: Find all solutions:
2cos(x)+1=0
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Find all solutions:
2cos(x)+1=0
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cos(x) = -1/2
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x = 120 + 360n or x = 240 + 360n where n = 1,2,3,....
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Cheers,
Stan H.
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