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Practice Problems with Solutions made by me!:
http://www.teacherspayteachers.com/Product/Calculus-The-Substitution-Rule-U-substitution
When Do I Have to Change the Limits of Integration? http://www.youtube.com/watch?v=FJoyIAIC1Ag
More Complicated U-Substitution Examples http://www.youtube.com/watch?v=x06V9xuLdqg
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Integration using U-Substitution of Indefinite Integrals. Just a little introduction to u-substitution. An old video! :)