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Trigonimetric Integration

  1. Feb 25, 2014 #1
    1. The problem statement, all variables and given/known data

    ∫secxtan3x dx

    2. Relevant equations



    3. The attempt at a solution
    ∫secxtanx(tan2x) dx
    ∫secxtanx(sec2x-1) dx

    Is u supposed to equal secx?
     
  2. jcsd
  3. Feb 25, 2014 #2
    Du=Secxtanx
    I like to rearrange my integral

    ∫(secx^2-1) secxtanx dx
    ------------(^ ^ Du^^)

    Since you pulled out secxtanx as du.
    and converted the remaining factors to secants.All you have to do now is
    take the integral of
    ∫(secx^2-1) and that will be your answer
     

    Attached Files:

  4. Feb 25, 2014 #3
    Thanks
     
  5. Feb 25, 2014 #4
    No problem! :)
     
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