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. Let me write that down. So if we wrote v of u of x, which is sine of x, if we did v of u of x, that is going to be equal to cosine of, instead of an x plus one, it's going to be a u of x plus one. And u of x, let me write this here, u of x is equal to sine of x.