This is just part of it. And so this definite integral represents the area from pi to two pi between the curve and the x-axis. And you might already know that this area is going to be, or this part of the definite integral would be negative, and this would be positive and they'll cancel out, and this would all actually end up being zero in this case. But this exercise for this video is to rewrite this as a limit as n approaches infinity of a Riemann sum. So as a Riemann sum, what we wanna do is think about breaking this up into a bunch of rectangles. So let's say, or I should say n rectangles. So that's our first one right over there.