Upper and lower Riemann Sums
This applet shows how upper and lower Riemann sums can approximate an integral [math]\int^b_a f(x) \, \textrm{d}x[/math][br]Further, they show that as the number of strips [math]n[/math] increases, the Riemann sums converge to true value of the definite integral.[br]Input your own function into the textbox and set the limits to different values.
Inverse Function and Derivative
Improper Integrals
Calculus - Arc Length
The Integral Test
Consider the series Σ1/n². How does the area of the rectangles plotted below compare with the sum of the series?
Click the checkbox to show the function f(x) = 1/x². Notice that the sum of the areas of the boxes is the sum of the series - but it is also a left Riemann sum for the integral of f(x) from 1 to ∞ (with one box leftover). If you drag the slider over, you can also see that the areas of the boxes make a right Riemann sum for the integral of f(x) from 1 to ∞ (without any leftover). So if the integral makes sense, so does the series!