1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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
    Integration


    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
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook