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Homework Help: Trig integral

  1. Jul 3, 2009 #1
    1. The problem statement, all variables and given/known data

    I(tan^3x * sec^4x,x)
    u=secx du=secxtanx

    im new to this and my book is showing diffrent solutions i see nothing wrong here
    2. Relevant equations

    3. The attempt at a solution
    Last edited: Jul 3, 2009
  2. jcsd
  3. Jul 3, 2009 #2
    Your answer is correct. What is the solution from your book?
  4. Jul 3, 2009 #3
  5. Jul 3, 2009 #4
    Are you sure the two solutions are different? (By more than just adding a constant.)
  6. Jul 3, 2009 #5
    That answer is also correct. You can get that answer from yours by using sec2 = tan2x + 1, multiplying out the numerators, and simplifying.

    The answer you got seems to be the easiest integral to find for the problem.
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