HP71B Integral Questions

[Wes Loewer]

(02-08-2020 10:59 AM)J-F Garnier Wrote:  Actually, the endpoints are not really left out, just it's useless to evaluate the function at the endpoints since their contribution to the sum is null due to the (1-u²) factor. So nothing is missing in the sum.

If the outside trapezoids don't contribute to the sum, isn't that equivalent to leaving them out? Wouldn't the approximate area of the outer intervals be missing from the sum?