So what we end up with is equal to zero over zero. And as we've talked about before, if we had something non-zero divided by zero, we'd say, okay, that's undefined. We might as well give up. 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.