calculates the integral in a certain interval (area between graph and x-axis)
reference: https://www.swl.k12.oh.us/Downloads/4-6%20Numerical%20Integration.pdf
check the results of the script: https://www.geogebra.org/classic?lang=en
kraemerlukas314/trapezoidal-sum
calculates the integral in a certain interval (area between graph and x-axis)
C++