Answer
$$-1$$
Work Step by Step
\begin{align*}
\lim _{x \rightarrow \pi}\frac{1}{\cos x}&=\frac{1}{\cos \pi}\\
&=\frac{1}{-1}\\
&=-1.
\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 2 - Limits - 2.4 Limits and Continuity - Exercises - Page 68: 72
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