Chapter 2 - Limits - 2.4 Limits and Continuity - Exercises - Page 68: 72

$$-1$$

Work Step by Step

\begin{align*} \lim _{x \rightarrow \pi}\frac{1}{\cos x}&=\frac{1}{\cos \pi}\\ &=\frac{1}{-1}\\ &=-1. \end{align*}

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