So if I have one plus the square root of two sine theta over cosine two theta, as you can imagine, the things that might be useful here are our trig identities. And in particular, cosine of two theta seems interesting. Let me write some trig identities involving cosine of two theta. I'll write it over here. So we know that cosine of two theta is equal to cosine squared of theta minus sine squared of theta, which is equal to one minus two sine squared of theta, which is equal to two cosine squared theta minus one. And you can go from this one to this one to this one just using the Pythagorean identity, and we proved that in earlier videos in trigonometry on Khan Academy. Now, do any of these look useful?