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Homework Help: Integrate cos[(pi/9)(x^2)

  1. May 2, 2010 #1
    1. The problem statement, all variables and given/known data
    Integrate cos[(pi/9)(x^2)

    2. Relevant equations
    Is there a trig identity for the cos(x^2) ?

    3. The attempt at a solution

    dU= [2(pi)/9] (T)dT dT= dU/ {[2(pi)/9 (T)]}

    Substitute in get cosU dU/ {[2(pi)/9 (T)]} Now what?
  2. jcsd
  3. May 2, 2010 #2


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    Homework Helper
    Gold Member

    Do you mean:

    [tex]\int \cos\left(\frac{\pi x^2}{9}\right)dx[/itex]

    or something else? Are you given integration limits, or are you only asked for the indefinite integral?
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