Answer
$tanx$
Work Step by Step
$tanx$ has the derivative $sec^2$, which is already found in the problem and can cancel out during $u$ substitution.
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: 4
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