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: Trigonometric Substituion

  1. Apr 15, 2008 #1
    1. The problem statement, all variables and given/known data
    Evaluate the Integral: Sqrt[(X^2)+9]

    2. Relevant equations
    I know its an Integration By parts problem, but I dont know how to start it.

    3. The attempt at a solution

    Im JUST learning this as I type this problem out, Ive just been stuck on it for a while and my book does a horrible job of explaining how to do problems. If anybody could explain the Trigonometric substitution technique or knows of a good website that explains it I would be very grateful.

    For this problem though, all I did was set x=3sin(u) and dx=3cos(u).

    I dunno if thats right though, because like I said, I just "learned" this yesterday
  2. jcsd
  3. Apr 15, 2008 #2


    User Avatar

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