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Asked by Ellie

Find all solutions in the interval [0, 360) 8cos^2x+6cosx+1=0
8 years ago

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Answered by Steve
(4cosx+1)(2cosx+1) = 0

now it's a cinch...
8 years ago
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Find all solutions in the interval [0, 360) 8cos^2x+6cosx+1=0

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