Slope of Secant and Tangent Lines

Change the value of 'h' on the slider to move the secant line.
Compare the slope of the secant line to that of the tangent line.
What happens when h=0?

Then move the Point A to find the slope of the Tangent line at other points on the curve.

Finally, you are also able to change the function. Right Click on the curve to do so.

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John Maharry, 12/16/2008, Created with GeoGebra