SOLUTION: Cos^2(x)-5cos(x)+4=0

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Question 544049: Cos^2(x)-5cos(x)+4=0
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Cos^2(x)-5cos(x)+4=0
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Quadratic in cos(x):
Factor:
(cos(x)-4)(cos(x)-1) = 0
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cos(x) = 4 or cos(x) = 1
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Only cos(x) = 1 is legitimate
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x = 0
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Cheers,
Stan H.