If you view this as, if you view this as a squared minus b squared, we know that this can be factored as a plus b times a minus b. So I could rewrite this. This is equal to one minus cosine theta over two times, I could write this as one plus cosine theta times one minus cosine theta. One plus cosine theta times one minus, one minus cosine theta. And now this is interesting. I have a one minus cosine theta in the numerator, and I have a one minus cosine theta in the denominator. Now we might be tempted to say, oh, well, let's just cross that out with that, and we would get, we would simplify it and get f of x is equal to one over, and we could distribute this two now, we could say two plus two cosine theta.