So we're gonna do it on the left-hand side. So it's gonna be, we're gonna take that with respect to t, derivative of that with respect to t. We're gonna take the derivative of that with respect to t. And then we're gonna take the derivative of the right-hand side, this constant, with respect to t. So let's think about each of these things. So what is this, let me do this in a new color, the stuff that I'm doing in this aqua color right over here. How could I write that? So I'm taking the derivative with respect to t. I have sine of something, which is itself a function of t. So I would just apply the chain rule here. I'm first going to take the derivative with respect to x of sine of x. I could write sine of x of t, but I'll just revert back to the sine of x here for simplicity. And then I would then multiply that times the derivative of the inside, you could say, with respect to t, times the derivative of x with respect to t. This might be a little bit counterintuitive to how you've applied the chain rule before when we only dealt with x's and y's, but all that's happening, I'm taking the derivative of the outside of the sine of something with respect to the something, in this case it is x, and then I'm taking the derivative of the something, in this case x, with respect to t. Well, we can do the same thing here for this second term here.