March 24, 2006 7:10 am
Larson ch 1.4, p. 75 - 78.
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Interesting. The limit fails to exist since the right and left limits do not agree. Yet Mathematica gives an answer of 1. This at least illustrates the value of obtaining a plot as well as an analytic solution.
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Super! Setting the Direction to zero is equivalent to computing both the right and left sided limits. Let me try a quick check.

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Perfect.
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Created by Mathematica  (March 24, 2006)