Well, this might start making you think about the chain rule, because if this is true, then that means that capital F prime of x is going to be equal to h prime of g of x, h prime of g of x, times g prime of x. And so what would that be? Well, we already know what h prime of x is. 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.