In Engineering, you won't encounter that kind blue pest function,
unless you want to push the bridge to collapse [so to speak].
However, some function [mostly from spline(s)] may look innocent,
but the ordinary Simpson Integrator will scrap/fail.
The Adaptive would be a good check ... get inspired by this lecture.

Thanks Carlos for this Adaptive Algo.

Integral 000 FD Adaptive Copy.sm (59 KiB) downloaded 86 time(s).