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Homework Help: Integral help

  1. Sep 11, 2008 #1
    1. The problem statement, all variables and given/known data
    It looks deceptively easy, but I can't seem to get it...
    [tex]\int^{\frac{\pi}{4}}_{0}{\\sec^4{x}\tan^4{x}}\,dx[/tex]


    2. Relevant equations

    [tex]\sec^2{x} = \tan^2{x} +1[/tex]

    3. The attempt at a solution
    I've tried, but they all end up as trigonometric polynomials
     
    Last edited: Sep 11, 2008
  2. jcsd
  3. Sep 11, 2008 #2

    Dick

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    Science Advisor
    Homework Helper

    It IS easy. Substitute u=tan(x).
     
  4. Sep 11, 2008 #3
    ah shoot! Thanks, now I got it
     
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