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.