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Help with double integral problems

  1. Aug 3, 2012 #1
    Can someone explain to me how I would arrive at this answer?:

    This double integral problem came up in a practice test I was taking, and I just can't figure it out. I tried integrating it but couldn't figure out how to integrate cos(x^2)dx and when I put that into Wolfram Alpha it said it involved some special function that seems much too advanced for the level of the course the test is from (it's from a first year multivariable calculus class). Thanks!
  2. jcsd
  3. Aug 3, 2012 #2


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    Draw the region then use your picture to reverse the order of integration.
  4. Aug 3, 2012 #3
    Aha, got it. Thanks much.
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