[maxima] approaching integral values

Hi !

I just needed to compute (get an approximating value)

I've taken a class in Maxima, but erm... either we didn't do integrals, either I forgot what we did lol!

(the second option may be the more relevant ^^)

I typed this (for the second one)

Code:

`integrate(exp(x^2)*2/3, x, 1, 2)`

and it gives something with the erf function (nothing surprising)

and when adding the float(...), it gives the erf function as well...

And it looks like it works with Maple, but I don't have Maple, I'm a poor student... xD

Anyway, do you know some *good* (and free) website where it is possible to compute such things ?

Thanks