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Find derivative using fundamental theorem of calculus part 1

  1. Dec 19, 2011 #1
    1. The problem statement, all variables and given/known data


    3. The attempt at a solution

    since cos(x^2) is on bottom i flipped it and so it becomes negative. then I got

    -[(1+cos(x^2))(-sin (x^2))(2x)]

    substituting with sqrt(pi/2) I keep getting the answer as sqrt(2pi) since the negatives cancel however it says the answer is supposed to be -sqrt(2pi). What am I doing wrong?
  2. jcsd
  3. Dec 19, 2011 #2


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    Science Advisor
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    I don't think you are doing anything wrong. I think the given answer is wrong.
  4. Dec 19, 2011 #3
    thank you. I've been going crazy over this question for a long time
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