So, let me do this in another color. This part right over here is going to be equal to, everywhere we see an x here, we'll replace with a g of x. So it's going to be two, two times sine of x, two sine of x, and then minus one, minus one. This is this right over here. And then what's g prime of x? G prime of x, well, g prime of x is just, of course, the derivative of sine of x is cosine of x, is cosine of x. So this part right over here is going to be cosine of x.