Question 920590
Find all solutions: 
2cos^2 x + cos x = 1 
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2cos^2(x) + cos(x) - 1 = 0
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Factor::
(2cos(x)-1)(cos(x)+1) = 0
cos(x) = 1/2 or cos(x) = -1
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x = +/-pi/3 or x = pi
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Cheers,
Stan H.
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