Entering Constants 
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The graph tool understands seven constants.
Fixed Constants
e ~ 2.718281828 pi ~ 3.141592654
These constants can be used in functions, axes, domains, points and vectors.
Variable Constants
Variable constants (now there is an interesting concept  they probably should be called parameters) allow you to examine how changing numbers in a function affects the function's shape.
The graph tool reserves a, b, c, d and m as constants that can be included in functions. They are entered in the same way as the variables x, y, r, t and th.
For example, you can enter the following function
y = ax2 + bx + c
and examine how changing a, b and c affects the parabola.
