Answer
$$ du = \sec^2 x dx .$$
Work Step by Step
Recall that $(\tan x)'=\sec^2 x$.
$$ u=\tan x \Longrightarrow du = \sec^2 x dx .$$
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: 4
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