On Saturday, January 15, 2022 at 12:19:28 PM UTC-5, Nasser M. Abbasi wrote:
...
> Here is the short version:
>
> restart;
> integrand:=1/(exp(x^3/3)*x^2);
> y2:= int( integrand, x);
>
> Maple gives
>
> 1/9*3^(2/3)*(-9/10*x^2*3^(2/3)/(x^3)^(1/3)*exp(-1/6*x^3)*
> WhittakerM(1/3,5/6,1/3*x^3)-9/2/x^4*3^(2/3)*(x^3+2)/(x^3)^(1/3)*
> exp(-1/6*x^3)*WhittakerM(4/3,5/6,1/3*x^3))
>
> but this does not differentiate back to the integrand. I tried
> simplify and assumptions. No luck.
>
> I think the Maple antiderivative is wrong but I am still not sure.
Using Maple 2021.1,
restart;
integrand:=1/(exp(x^3/3)*x^2):
y2:= int( integrand, x):
1/9*3^(2/3)*(-9/10*x^2*3^(2/3)/(x^3)^(1/3)*exp(-1/6*x^3)*WhittakerM(1/3,5/6,1/3
*x^3)-9/2/x^4*3^(2/3)*(x^3+2)/(x^3)^(1/3)*exp(-1/6*x^3)*WhittakerM(4/3,5/6,1/3*
x^3))
expand(simplify(convert(diff(y2,x),compose,
hypergeom,StandardFunctions))):
exp(-1/3*x^3)/x^2