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Solve Sin6x+sin4x

  1. May 6, 2008 #1
    1. The problem statement, all variables and given/known data


    2. Relevant equations




    3. The attempt at a solution



    What shall I do next?
  2. jcsd
  3. May 6, 2008 #2


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    What exactly are you suppose to do? What is the question?

    EDIT: Is it to solve for x?
  4. May 6, 2008 #3
    Yes. I need to find x.
  5. May 6, 2008 #4
    Ohh... Can I solve it like this:






  6. May 6, 2008 #5


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    That is partially correct. But you're missing out on other possible values of x. [tex]x=\frac{\pi}{2} [/tex] also satisfies the equation but it's not expressible in your answer.

    Use this trigo identity:
    [tex]2sin(Ax)cos(Bx) = sin((A-B)x) + sin((A+B)x)[/tex]
  7. May 6, 2008 #6
    Yes I forgot.


  8. May 6, 2008 #7


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    Where did pi in your first equation come from?
  9. May 6, 2008 #8
    Remember this:


    x=pi - arcsinx + 2kpi

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