Well, it's just going to be the derivative of g of x. The derivative of two x is just going to be two. And then the derivative, and this is the fundamental theorem of calculus right over here, the derivative of the definite integral from zero to x of f of t dt, that's just going to be f of x. That is just going to be f of x. So that is g prime of x. We did this second part right over there. That is g prime of x.