# Calculators Anyway to do infnite series with a TI-89?

1. Nov 11, 2004

### FancyNut

I have A LOT of problems in work sheets to do before my midterm on friday for calculus. The thing is, I don't have the solutions but I do have a TI-89 and it helped with checking my answers for integrals.

My question is, how do I (or even can I?) work with infinite/power (see if they converge, diverge, etc..) series with a TI-89? I only have the manual as a .pdf file and I can't find anything in it but I just want to make sure that I'm not missing something...

Thanks for any help.

2. Nov 11, 2004

### Justin Lazear

Your 89 has a sum function in f3: Calc / 4: Sum and an infinity button at Diamond / infinity (the catalog button). Why don't you take them out for a test drive?

The sum function takes arguments function, variable, lower limit, upper limit. For instance, $\Sigma(1/x^2,x,1,\infty)$ returns $\frac{\pi^2}{6}$.

--J

3. Nov 11, 2004

### FancyNut

heh I just tried some geometric series and it works. Sweet.

Thanks man!

4. Nov 11, 2004

### FancyNut

hmm ok how about a power series (conv. interval..)? When I try it it just returns what I entered...

Last edited: Nov 11, 2004
5. Nov 11, 2004

### FancyNut

so... anybody wants to help?

I really need this.

Can the TI-89 even do power series and taylor polynomials?