Answer
Because we go from using the variable $x$ to the variable $u$.
Work Step by Step
N/A
Calculus: Early Transcendentals (2nd Edition)
by Briggs, Bill L.; Cochran, Lyle; Gillett, Bernard
Published by
Pearson
ISBN 10:
0321947347
ISBN 13:
978-0-32194-734-5
Chapter 5 - Integration - 5.5 Substitution Rule - 5.5 Exercises - Page 390: 2
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