Numerical integration methods

[Albert Chan]

(07-25-2022 03:27 AM)lrdheat Wrote:  Using x=2, and not using a program, just stepping through the equation manually using the HP 42S with it’s RPN (which I love), I cannot produce anything resembling.5326! I’ve come to the conclusion that I do not understand this function at all!

f(x) = x^2 * expm1(1/x^3), evaluated at x=2

2
ENTER X^2 *
LASTX X<>Y 1/X             // (1/x^3) (x^2)
E^X 1 - *

0.532593812267305267316028911247176

Or, more accurately, "E^X-1" for E^X 1 -

0.5325938122673052673160289112471756