Answer
$ du = 4 \sin^3 \theta \cos \theta \ d \theta $
Work Step by Step
$$ u=\sin ^4 \theta \Longrightarrow du = 4 \sin^3 \theta \cos \theta \ d \theta .$$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 5 - The Integral - 5.7 Substitution Method - Exercises - Page 275: 5
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