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Trigonometric Substituion

  • Thread starter cooltee13
  • Start date
25
0
1. Homework Statement
Evaluate the Integral: Sqrt[(X^2)+9]

2. Homework 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
 

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