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Homework Help: Trigonometric integration

  1. Feb 10, 2012 #1
    1. The problem statement, all variables and given/known data

    Screenshot2012-02-10at55111AM.png

    I don't understand why the x/2 is not being integrated. I would think one should use u substitution. u = x/2, du = x, but they're not doing that.
     
  2. jcsd
  3. Feb 10, 2012 #2
    Actually the book referred has used this substitution and have finally put u=x/2 again as question is asked in form of x/2 and not in u.
     
  4. Feb 10, 2012 #3

    Char. Limit

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    Gold Member

    Actually, they DID, but they skipped a couple of steps (like explaining HOW they integrated). If you try a u-substitution, you'll get the same answer they did.
     
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