And it might be a little bit confusing because e to the x is its own derivative, but this right over here, you can view this as this was the derivative of e to the x, which happens to be e to the x. That's what's exciting about that expression or that function. And then this is just e to the x without taking its derivative. They're of course the same thing. But anyway, now we can just simplify it. This is going to be equal to, this is going to be equal to, we could write this either as e to the x times cosine of x, times cosine of x, minus e to the x, e to the x, times sine of x, times sine of x. Or if you want, you could factor out an e to the x.