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Hi there and welcome to the forum!

This is very basic programming stuff. You'll want to look into either using Input or Prompt to input the data and then calculating results and storing them into ...

Try the new page I just put up if you haven't figured it out yet:

http://ti-89.org/gamesfaq.html

Are there any plans to offer a report abuse button for topics? I am getting tired of all this spam.
I'm working on it...I'm also implementing a CAPTCHA to disallow bots from the site.

This is possible...I can't remember off hand, but I think it's an optional argument. Look at the catalog and see what the last argument is for the popup. If it's optional, it'll be in brackets like: ...

Yup, it's on there. Just type in cot()

You can use the program Notefolio.

Or use the root command: root(3,3) is 3 in the 3rd root.
Exactly, this is your best answer. The first argument is what you want to find the root of and the second argument is which root.

Anyone who reads this: It's in your best interest to check out the valuable virus/spyware protection shown in the following page.

http://www.xenocide-rpg.com/viewthread.asp?id=480

Any help on these equations would be apreciated. Any program out there that solves them?

Solve:
y’ = (-2) / (x^2 y) with condition y(0)= -1

and

(1/4)yt – yt-1 = -9 with condition y0 = 10
...

Just wanted to say Merry Christmas to everyone. Hope everyone has a good time. Razz

I was just notified today that TI-89.org has been removed from the BadWare list. Expect traffic to JUMP again.

Phew. Cool

I'm sure you can find what you're looking for here:

http://www.ticalc.org/pub/89/

Yes, TI-89.org was improperly marked as BadWare. My guess is one of the popups that we used to have (took them all away) had BadWare in it which caused us to be labeled BadWare.

I've contacted Goo ...

Well, I hope the calculator is less than a half old. If it is, it's still on warranty and you can most likely get it replaced. Otherwise, you'll probably have to get it repaired...which is NOT cheap ...

You could also try placing a "*" between all letters
Good point. Remember that the TI-89 allows for more than just single character variables. Therefore xy is not variable x times variabl ...