When do we use the method of substitution in integration? and is the "u-susbtitution" similar to the "reverse chain rule"

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter6: Vector Spaces
Section6.7: Applications
Problem 16EQ
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When do we use the method of substitution in integration? and is the "u-susbtitution" similar to the "reverse chain rule" 

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          The Method of Substitution:The method of substitution is used in integral when it contains some function and its derivative.In such case, we set u equal to the function and rewrite the integral in terms of new  variable u.

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