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Homework Help: Insanely easy question - trig functions, need a quick question answered

  1. Apr 7, 2009 #1
    1. The problem statement, all variables and given/known data
    I need to solve the equation [tex]cos 5x + cos 3x = cos x[/tex]

    Do the first two terms add together to be cos 8x? Then use double angle formula to solve?
  2. jcsd
  3. Apr 7, 2009 #2


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    Homework Helper

    No. cos 5x + cos 3x is not equal to cos8x.
    Use formula to convert sum of trig. function to product form.
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