__Example__:*f* (*x*)=4-*x*^{2}

** Click** the "Graph" button
(this button also refreshes the graph).

** Enter** the endpoints of the interval [

**Example:**
[

** Click** the
"+" and "-"
buttons under the labels marked "n="
to change the
number of subintervals used for each method.

__Example__:*n*=20 for both

** To erase** the graph and all input fields, setting the
"n=" fields to default values, click the
"Clear" button.

__Exponential__:*f* (*x*)=*e ^{2}*,
[

__Trigonometric__:*f* (*x*) = sin *x*,
[*a*,*b*]=[0,3.14159],

*n*=10 for both