If you viewed, if you say, look, we could take an x, we put it into one function, that is, that first function is cosine of x, so first we evaluate the cosine, and so that's going to produce cosine of x, cosine of x, and then we're going to input it into a function that just takes things to the third power. So it just takes things to the third power, and so what are you going to end up with? Well, you're going to end up with, what are you taking to the third power? You're taking cosine of x. Cosine of x to the third power. This is a composite function. You could view this, you could view this as the function, let's call this blue one the function v, and let's call this the function u, and so if we're taking x and into u, this is u of x, and then if we're taking u of x into the input, or as the input into the function v, then this output right over here, this is going to be v of, well, what was inputted? V of u of x. V of u of x.