So let's see how we can simplify this a little bit. All of these terms, we have a 1 half delta x, so let's actually factor that out. So remember, this is our approximation of our area. So area is approximately, remember this is just a rough approximation, it's very clear actually. You might say this is pretty good using the trapezoids, but it is pretty clear that we are letting go of some of the area. We're letting go of that area, we're letting go of some of this right over here, you can barely see it, some of this right over here, you can barely see it. But we are, this is going to be, it looks like an underestimate, but it is a decent approximation.