[b]This is a reference applet to help you better (geometrically) visualize the meaning of the definite integral of a [i]difference[/i] of two functions. [/b] [b][color=#274e13]This definite integral can be interpreted as the area between the graphs of both functions.[/color][/b]  [i](See applet below.) [/i] [br][br][b]Feel free to enter in your own functions[/b] [b]([color=#0000ff]f [/color]and [color=#ff0000]g[/color]).[/b][br][b]Feel free to enter in your limits of integration (a and b) as well.[/b]