- Insert your function in the box "Fonction f(x)".[br]- Modify the interval [math]\left[a,b\right][/math] by moving the points A and B on the x-Axis.[br]- Drag the slider to right or to left to vary the [math]N[/math] value (number of partitions) or click on and use the left and right arrows.

You can see that when [math]N[/math] increases, the difference between the [b]Lower [/b]and the [b]Upper[/b] sums become closer and closer to zero. This means that those sums converges to the same value that is the exact value of the integral.