Secant Approximations

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The most fundamental approximation in calculus is the approximation of the tangent line by a secant line—this is the approximation that leads to the derivative. Use the sliders to change the point of tangency and the point through which the approximating secant is drawn.
Contributed by: Chris Boucher (March 2011)
Open content licensed under CC BY-NC-SA
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"Secant Approximations"
http://demonstrations.wolfram.com/SecantApproximations/
Wolfram Demonstrations Project
Published: March 7 2011