Descartess method for finding tangents depends on the idea
Chapter 11, Problem 91(choose chapter or problem)
Descartess method for finding tangents depends on the idea that, for many graphs, the tangent line at a given point is the unique line that intersects the graph at that point only. We apply his method to find an equation of the tangent line to the parabola y = x2 at the point 12, 42. See the figure.
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