And the derivative of e to the something with respect to something is just going to be e to that something. So it's going to be e to the cosine of x. So let me do that in that same blue color. So it's going to be e, actually let me do it in a new color. Let me do it in magenta. So the derivative of e to the something with respect to something is just e to the something. It's just e to the cosine of x.