Answer
$\lim\limits_{\phi\to\pi}(\phi\sec{\phi})=-\pi.$
Work Step by Step
$\lim\limits_{\phi\to\pi}(\phi\sec{\phi})=\pi\sec{\pi}=-\pi.$
We don't have an indeterminate form hence we just plug in the value of $\phi$ and get the final result.
Calculus 10th Edition
by Larson, Ron; Edwards, Bruce H.
Published by
Brooks Cole
ISBN 10:
1-28505-709-0
ISBN 13:
978-1-28505-709-5
Chapter 1 - Limits and Their Properties - 1.3 Exercises - Page 68: 70
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