50g

--- In 50g@yahoogroups.com, "OLLIVIER" <nicolas.ollivier@...> wrote:
>
> Hello,
> 
> I am studying the Fourier series,
> And when I want to calculate a sum:
>      	sum from 0 to infinity, 1/(2x+1)^4, and 
> the calculator gives me: PSI (0.5, 3)/96
> 
> But I must find : PI^4/96
> 
> So how I can find it?! if it's possible....
> 
> Thanks a lot
> 
> Nico
>
When the calc is in Exact mode, the Eval result of this summation is
given in terms of the special function "PSI". Just hit Right Shift,
then Enter to see the numeric answer 1.01467...
I haven't found an easy way to have this answer displayed in terms of
Pi. Here's a thread that may give you some ideas, though:
http://groups.google.com/group/comp.sys.hp48/browse_thread/thread/14e5022c987b8ed5/49a291fcb828b26d#49a291fcb828b26d

My old TI-89 popped right out with Pi^4/96.