Vertical tangent lines If a function f is continuous at a and , then the curve y = f(x) has a vertical tangent line at a and the equation of the tangent line is x = a. If a is an endpoint of a domain, then the appropriate one-sided derivative (Exercises 1–2) is used. Use this information to answer the following question.
The preceding definition of a vertical tangent line includes four cases: combined with
(for example, one case is .
Sketch a continuous function that has a vertical tangent line at a in each of the four cases.
Exercises 1
f(x) = |x − 2|; a = 2
Exercises 2
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