ABSTRACT
In evaluating the integral of a function of a single variable, one of the most useful tools is the so-called “substitution rule.” It is used in calculus, for example, to evaluate such an integral as ∫ 0 1 ( 2 x 2 + 1 ) 10 ( 4 x ) d x ; https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429494147/8bac823f-6827-4440-b418-8e92f8e17b25/content/eq584.tif"/>
