SOLUTION: cos^2x+2cosx+1=0

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Question 1055345: cos^2x+2cosx+1=0
Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website!
cos^2x+2cosx+1=0
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Factor::
(cos(x)+1)^2 = 0
cos(x) = -1
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x = pi rad or 180 degrees
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Cheers,
Stan H.
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