All right, so now we just have to figure out all of these things. So first of all, the derivative with respect to x of sine of x is cosine of x times derivative of x with respect to t, I'll just write that out here, derivative of x with respect to t. And then we're going to have, it's gonna be a plus here, the derivative of y with respect to t, so plus the derivative of y with respect to t, I'm just swapping the order here so that this goes out front. Now what's the derivative of cosine of y with respect to y? Well, that is negative sine of y. And so, actually let me just put a sine of y here, and then I wanna have a negative. So let me erase this and put a negative there. And that is all going to be equal to zero.