Example: f (x)=x2-1
Click the "Graph" button (this button also refreshes the graph).
Enter the antiderivative F (x) (so that F '(x)=f (x)) in the text input field marked "F(x)=".
Example: F (x)=x3/3-x
Enter the endpoints of the interval [a,b] for the definite integral in the text input fields marked "a=" and "b=", and click the "Graph" button to refresh.
To erase the graph and all input fields, click the "Clear" button.
f (x) = cos x
F (x) = sin x
In the "Polynomial" example above, part of the shaded area is above the x-axis (in blue) and part below it (in red). The area above the axis is a bit larger than the area below it, giving a positive value for net area (blue area minus red area).