So what if I said negative nine times negative sine of x? Well this is still gonna be nine sine of x. If you took negative nine times negative sine of x it is nine sine of x. And I did it this way because now negative sine of x it matches the derivative of cosine of x. So we could say that this is all going to be equal to, it's all going to be equal to, you have your negative nine out front, negative nine times, times, and I'll put it in brackets, negative nine times the antiderivative of negative sine of x. Well that is just going to be cosine of x. Cosine of x. And we're going to evaluate it at its bounds.