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Homework Help: Integration error

  1. Sep 29, 2010 #1
    1. The problem statement, all variables and given/known data

    Integral 17(sin(x))^3(cos(x))^9

    http://www.mediafire.com/imageview.php?quickkey=55l9ediwdqxsg4f&thumb=4 [Broken]

    2. Relevant equations

    3. The attempt at a solution
    I get (-17(5sin(x))^2 +1)(cos(x))^10)/60. But I'm wrong. It says I need to change something but I don't know what.
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Sep 29, 2010 #2
    substitute for cosx. then you will see that one of the sinx goes out with the change of integration variable. then you should be able to solve it easily
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