freeware http://groups.yahoo.com/group/mathc/

* Calculus : Derivative Normal.

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Windows : Dev-C++ 4
Linux : gcc abc.c -lm Return
a.out Return

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* You can compile the *.c files directly without create a project.

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c03b1A.c : Draw the normal.
c03b1B.c : Animate the normal.
c03b1C.c : Find the intersection points of the normal with the x-y
axis.
c03b1D.c : Find PA, the length of the normal from P to the x axis.
c03b1E.c : Find PB, the length of the normal from P to the y axis.
c03b1F.c : Find AM, the length of the under normal.


c03b2A.c : Draw the normal.
c03b2B.c : Animate the normal.
c03b2C.c : Find the intersection points of the normal with the x-y
axis.
c03b2D.c : Find PA, the length of the normal from P to the x axis.
c03b2E.c : Find PB, the length of the normal from P to the y axis.
c03b2F.c : Find AM, the length of the under normal.


c03b3A.c : Draw the normal.
c03b3B.c : Animate the normal.
c03b3C.c : Find the intersection points of the normal with the x-y
axis.
c03b3D.c : Find PA, the length of the normal from P to the x axis.
c03b3E.c : Find PB, the length of the normal from P to the y axis.
c03b3F.c : Find AM, the length of the under normal.


c03b4A.c : Draw the normal.
c03b4B.c : Animate the normal.
c03b4C.c : Find the intersection points of the normal with the x-y
axis.
c03b4D.c : Find PA, the length of the normal from P to the x axis.
c03b4E.c : Find PB, the length of the normal from P to the y axis.
c03b4F.c : Find AM, the length of the under normal.

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The members can try these links :

http://groups.yahoo.com/group/mathc/files/C/D/c03b.zip