So it's gonna take the form of the limit as n approaches infinity, and we can have our sigma notation right over here. And I would say from, let's say, i is equal to one all the way to n. Let me scroll down a little bit so it doesn't get all squenched up at the top. Of, and so let me draw what's actually going on so that we can get a better sense of what to write here within the sigma notation. So, let me do it large. So if this is pi right over here, pi right over here, this would be three pi over two, and this would be two pi right over here, two pi. Now what does the graph of cosine of x do? Well, at pi, cosine of pi is negative one.