If you've never heard of the term composite functions or if the first few minutes of this video look unfamiliar to you, I encourage you to watch the algebra videos on composite functions on Khan Academy. The goal of this one is to really be a little bit of a practice before we get into some skills that are necessary in calculus, in particular, the chain rule. So let's just review what a composite function is. So let's say that I have, let's say that I have f of x, f of x being equal to one plus x. And let's say that we have g of x is equal to, let's say g of x is equal to cosine of x. So what would f of g of x be? F of g of x.