### Graphical Reasoning In Exercises 29 and 30 ,use t…

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Problem 28

In Exercises 21-28, use the graph to find the limit (if it exists). If the limit does not exist, explain why.
$$\lim _{x \rightarrow \pi / 2} \tan x$$

Limit does not exist.

In Exercises 21-28, use the graph to find the limit (if it exists). If the limit does not exist, explain why. $$\lim _{x \rightarrow 1} f(x)$$ In Exercises 21-28, use the graph to find the limit (if it exists). If the limit does not exist, explain why.$$\lim _{x \rightarrow 5} \frac{2}{x-5}$$ In Exercises21-28, use the graph to find the limit (if it exists).If the limit does not exist, explain why. $\lim _{x \rightarrow 0} \sec x$
Chapter 1
Limits and Their Properties
Section 2
Finding Limits Graphically and Numerically
Calculus of a Single Variable

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