_-substitution: rational function | AP Calculus AB | Khan Academy

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Another example of using u-subsitution. Created by Sal Khan.
Watch the next lesson: https://www.khanacademy.org/math/ap-calculus-ab/ab-antiderivatives-ftc/ab-u-substitution/v/u-substitution-with-ln-x?utm_source=YT&utm_medium=Desc&utm_campaign=APCalculusAB
Missed the previous lesson? https://www.khanacademy.org/math/ap-calculus-ab/ab-antiderivatives-ftc/ab-u-substitution/v/u-substitution-defining-u-exp?utm_source=YT&utm_medium=Desc&utm_campaign=APCalculusAB
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