# Derivative as a Function

The line tangent to a curve at a point is shown along with the derivative for several functions. To change functions click the "Next" button. Move the point on the -axis or click the play button. As the point is moved a dot of the derivative at that point is shown on the lower graph.
Selecting "Show as function" will display all points of the derivative as a curve and the derivative function.

Look at each function and move to see that the derivative of a function is also a function.

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