What is the equation of a vertical tangent line?

Asked by Amy McMahon

The curve y = f(x) has a vertical tangent line at the point (a, f(a)) if (i) f(x) is a continuous at x = a. of f(x), the limit should be an appropriate side limit. See Example 1). When both (i) and (ii) are satisfied, the vertical line x = a is a tangent line of the curve y = f(x) at the point (a, f(a)).

Rosa Pérez, BA Contributor
Rosa Pérez
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