So to actually compute this, you would use the product, the product rule. But this is a composition. Here you have f of g of x, not f of x times g of x. So here you have, that is our g of x, it equals sine of x. And then our f of g of x is the natural log of sine of x. So this is f of g of x. F of g of x, just like that. If someone asked you just what f of x was, well, that would be natural log of x.