Please help me solve this problem.... it's been awhile so I am a bit rusty!

Thanks

cos x + 2 cos x = -1 over the interval [0, 2 p)

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- May 25th 2010, 11:16 AM #1

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- May 25th 2010, 11:25 AM #2

- May 25th 2010, 11:35 AM #3

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