SOLUTION: cos 2u − cos u = 0. Find all the solutions in the interval [0,2pi)?

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Question 1155864: cos 2u − cos u = 0. Find all the solutions in the interval [0,2pi)?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
cos 2u − cos u = 0
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Is it cos(2u) ?
Or cos^2(u) ?
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Parentheses are free.
Use some.