So let's do that. And actually, let me move over this h over 500 a little bit. So let me move it over a little bit so I have space to show the derivative operator. So let's write it like that. And now, let's take the derivative with respect to t. So d, d t, I'm gonna take the derivative with respect to t on the left, we're gonna take the derivative with respect to t on the right. So what's the derivative with respect to t of tangent of theta? Well, we're just going to apply the chain rule here.