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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


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