Math Medics
S.o.s. Math: Trigonometric Substitutions
This detailed tutorial explains trigonometric substitution. Includes formulas, equations and examples.
Other
Karl's Calculus Tutor: Methods of Integration
This site provides a detailed overview of the various methods of integration. This first page covers the "gist" of the methods available, followed by much more detail on subsequent pages.
Interactive Mathematics
Interactive Mathematics: Integration by Trig Substitution
Having trouble integrating those tough functions? Try using Trigonometric Substitution. This lesson demonstrates the process and allows for you to practice using the examples provided.