And hopefully, it'll even start to seem a little bit simple and intuitive over time. So let's say that I had a function. Let's say I have a function h of x. And it is equal to, just for example, let's say it's equal to sine of x. Let's say it's equal to sine of x squared. Now, I could have written it like this, sine squared of x. But it'll be a little bit clearer using that type of notation.