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. 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.