SecantTangent Applet

This applet draws a tangent line to a graph at a point marked by a red draggable disk. By dragging this disk, you can move the point. A secant line is drawn from this point to another point, which is marked by a green draggable disk. You can also set the x-coordinates of the point by entering them in the input boxes at the bottom of the applet. The slope of the secant line is shown at the upper left.

You can change the viewing rectangle in several ways:

This applet is one of the configurable applets provided by David Eck, author of Java Components for Mathematics.

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