Secant and Tangent Lines

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This Demonstration illustrates the connection between the secant line and the tangent line at a point on a curve. You can vary the point of tangency and the difference of the
values of the two points defining the secant line.
Contributed by: Joshua Fritz, Angela Sharp, and Chad Pierson (September 2007)
Open content licensed under CC BY-NC-SA
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"Secant and Tangent Lines"
http://demonstrations.wolfram.com/SecantAndTangentLines/
Wolfram Demonstrations Project
Published: September 18 2007