But when we have this indeterminate form, it does not mean that the limit does not exist. It's usually a clue that we should use some tools in our toolkit, one of which is to do some manipulation here to get an expression that maybe is defined at theta is equal to, or is not an indeterminate form, at theta is equal to negative pi over four, and I will see other tools in our toolkit in the future. So let me algebraically manipulate this a little bit. 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.