The purple area we can show is the definite integral from x to c of our function of t. Cosine t over t dt. And then to that, we're going to add the green area. And then we'll get the original area. So the green area, for the green area, our lower bound of integration is now our constant c. And our upper bound of integration is x squared. It's going to be of cosine t over t dt. And this is a form where if we know how to apply the chain rule, we can apply the fundamental theorem of calculus. And this is almost in a form.