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Homework Help: Solve this equation for x

  1. Apr 6, 2013 #1
    1. The problem statement, all variables and given/known data

    0 = sin(x) - cos(2x)

    Original problem asks to find the critical numbers of f(x) = 2cos(x) + sin(2x) . . . above is its derivative simplified and what I need to solve.
     
  2. jcsd
  3. Apr 6, 2013 #2

    epenguin

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    Homework Helper
    Gold Member

    Have you ever seen cos2x in any formula?
     
  4. Apr 6, 2013 #3
    Yes...

    cos2x=1-2sin^2(x)

    I can use that to my advantage I realizes...
     
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