Answer
$$\ln 2$$
Work Step by Step
\begin{align*}
\int_{0}^{\pi / 3} \tan x d x&=\ln | \sec x| \bigg|_{0}^{\pi / 3}\\
&=\ln 2-\ln 1\\
&=\ln 2
\end{align*}
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 8 - Techniques of Integration - 8.2 Trigonometric Integrals - Exercises - Page 403: 55
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