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Homework Help: Need help in Integration

  1. Mar 22, 2008 #1
    1. The problem statement, all variables and given/known data
    Integral [sec(x^2)/ 81 + tan (x^2)]

    2. Relevant equations

    sinx^2 + cos x^2=1
    sec= 1/cos
    3. The attempt at a solution

    integral[ 1/81cos (x^2) + 81(sin(x^2)/cos(x^2))]
    = 1/81 integral [1/ 1/cos(x^2)]= 1/8 integral[cos(x^2)]
    = 1/8 sin(x^2)
    This was my answer. But this is not right according to multiple choice quiz. Please let me know how to do this problem.

  2. jcsd
  3. Mar 22, 2008 #2

    Gib Z

    User Avatar
    Homework Helper

    Something makes me think finding the anti derivative won't be easy. But since this is a Multiple choice question, can you see how we can test each of those answers?
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