1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

    User Avatar
    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...
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted