You could say, all right, let's see, I have this sine of x right over here. So what if I called that an f of x? So let's say I call that, well, actually, let me use a different variable so we don't get confused here. Let me call this u of x, the sine of x right over there. So this would be cosine of u of x plus one. And so if we then divided, if we then defined another function as v of x being equal to cosine of whatever its input is plus one, well, then this looks like the composition of v and u of x. Instead of v of x, if we did v of u of x, then this would be cosine of u of x plus one.