And u of x, let me write this here, u of x is equal to sine of x. That's how we've set this up. So we can either write cosine of u of x plus one or cosine of sine of x plus one, which was exactly what we had before. 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.