So this is just going to be 2 times the thing that I had. So whatever I'm taking the derivative with respect to. Here it was with respect to x. Here it was with respect to a. Here it's with respect to sine of x. So it's going to be 2 times sine of x. Now, so the chain rule tells us that this derivative is going to be the derivative of our whole function with respect or the derivative of this outer function, x squared, the derivative of x squared, the derivative of this outer function with respect to sine of x.