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
>

I'm guessing a flag setting. The easiest way I know to toggle between
Real and Complex is to hold down Left Shift, while still holding it
down hit Tool. To quickly toggle between Exact and Approximate, hold
down Right Shift, while still holding it down hit Enter. Another
possibility is Rigorous (Flag -119) or, perhaps quicker is Mode, CAS
(you'll can toggle Rigorous 5th line down).
To see all your flags type RCLF. Mine currently are, with Radians,
Decimal, Real, Approximate and Rigorous Off:
{ # 36028806751912944d# 0d# 58547911847313432d# 0d}
Another way to see this string is to hold down Left Shift, while still
holding it down hit Mode, (let up on Left Shift here) hit Flag, hit
Next, hit RCLF.

Here's a good discussion of Fourier Series on HP 49G (HP 50g will be
the same):
http://groups.google.com/group/comp.sys.hp48/browse_thread/thread/e8d9fc11260a6a6/3ce5ddb8aaea2082?hl=en&lnk=gst&q=Fourier+series#3ce5ddb8aaea2082

If this doesn't help, write back with a keystroke example of what
you're doing, along with your RCLF string.