Wherever you saw a t, you replace it with an x squared. And then you're going to multiply that times the derivative of x squared with respect to x. So that's just going to be derivative of x squared with respect to x is just 2x. And we're done. We just need to simplify this thing. All of this is going to be equal to negative cosine x over x plus, well, this is going to cancel out with just one of those, plus 2 cosine x squared over x. And I guess we could simplify it even more as being equal to, and we can swap these.