There are differents methods to aproximate an integral. This repository offers and alternative way to calculate those methods.
There are 4 methods, each one has two files. The one without "-EXCEL" is special if you want to aproximate an intergal with points. Domain accept int numbers, float numbers and rational numbers. The other one with "-EXCEL" it's special if you have a large amount of data, submit the .xlsx to the function, stablish a few arguments and you'll get an stimate of an integral.