Secant Line Visualization

This GeoGebra Visualization shows the secant line, from f(a) to f(a+h), as h goes to zero.  The slider is set up to let h go from -1 to 1.  Drag the slider from side to side to see the secant line approach the tangent as h gets close to zero.




















This is a Java Applet created using GeoGebra from www.geogebra.org - it looks like you don't have Java installed, please go to www.java.com