Description by publisher
The derivative : The tangent.
a) You can see the result in Gnuplot.
* Draw the tangent.
* Animate the tangent.
* Find the intersection points of the tangent with the x-y axis.
* Find the length of the tangent from P to the x axis.
* Find the length of the tangent from P to the y axis.
* Find the length of the under tangent.
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