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Homework Help: Solve cosx^4-sinx^4

  1. Apr 24, 2009 #1
    1. The problem statement, all variables and given/known data
    simplify cosx4-sinx4


    3. The attempt at a solution

    I got cos2x

    does anybody wanna solve this and let me know if I am right ?
     
  2. jcsd
  3. Apr 24, 2009 #2
    Cos2x is correct.
     
  4. Apr 24, 2009 #3

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hi synergix! :smile:

    It's obviously cos2x :biggrin:

    if you're not sure, then either you didn't go the quick way (factorise a4 - b4 :wink:), or you're not familiar enough with your trignonometric identities :smile:
     
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