Date: Jun 7, 2012 7:53 AM
Author: GEIvey
Subject: Re: integration by substitution

But anything with a square inside a square root cries out for a trig substitution.  Let x= sin(u) so that (1- x^2)^(1/2)= (1- sin^2(u))^(1/2)= (cos^2(u))^(1/2)= cos(u)
and dx= cos(u)du.