Now, do any of these look useful? Well, all of these three are gonna be differences of squares so we can factor them in interesting ways. And remember, our goal at the end of the day is maybe cancel things out that are making us get this zero over zero. And if I could factor this into something that involves a one plus square root of two sine theta, then I'm gonna be in business. And it looks like this right over here, that can be factored as one plus square root of two sine theta times one minus square root of two sine theta. So let me use this. Cosine of two theta is the same thing, cosine of two theta is the same thing as one minus two sine squared theta, which is just a difference of squares.