It isn't just an x that we're taking to the third power, we are taking a cosine of x to the third power. So we're taking a function, you could view it this way, we're taking the function cosine of x, and then we're inputting it into another function that takes it to the third power. So let me put it this way. If you viewed, if you say, look, we could take an x, we put it into one function, that is, that first function is cosine of x, so first we evaluate the cosine, and so that's going to produce cosine of x, cosine of x, and then we're going to input it into a function that just takes things to the third power. So it just takes things to the third power, and so what are you going to end up with? Well, you're going to end up with, what are you taking to the third power? You're taking cosine of x. Cosine of x to the third power.