Mathc,
Matrices Packages,
Vectors Packages,
Gnuplot Packages.
 
Chapter 03 : The Derivative :
 The tangent :           
c03a.zip 
    (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.
 The normal :        
c03b.zip 
    (You can see the result in Gnuplot).
        
    * Draw    the normal.
    * Animate the normal.
    * Find the intersection points of the normal with the x-y axis.
    * Find the length of the normal from P to the x axis.
    * Find the length of the normal from P to the y axis.
    * Find the length of the under normal.