And so this function g of x, if we say u of x is equal to sine of x, if we say u of x is equal to sine of x and v of x is equal to cosine of x plus one, then we could write g of x as the composition of these two functions. Now, you could even make it a composition of three functions. We could keep u of x to be equal to sine of x. We could define, let's say, a w of x to be equal to x plus one. And so then, let's think about it. W of x, w of u of x, I should say, w of u, let me do the same color, w of u of x is going to be equal to, now my input is no longer x, it's a u of x, so it's going to be a u of x plus one or just sine of x plus one. So that's sine of x plus one.