Ti-89 — 163 discussions

I've got a TI-89, with which I'm trying to solve an inequality. Not a specific one, just in general. I try to use the 'solve' command just as for equations but with an inequal-sign instead, but it doesn't work. Anyone?

I have a class where I'm using the log function a lot, I would like to program a hot key to display log on my ti-89 for I don't have to mess with the catalog, any suggestions? Thanks Philip

Does anyone know how to graph the integral curves / slope fields of ODEs on the 89? I don't have a manual for mine, and suppose a few of you are quite familiar with it. Thanks in advance.

Ti-89 Titanium at bestbuy for 119.99(ALL TI 20% off) http://www.bestbuy.com/site/olspage.jsp?skuId=6621426&type=product&id=1082119968052 GRRRRR, I payed 20 dollars more a few days ago :cry: So if you want to buy a new calculator, they have 20% off all Ti calculators this week. They have...

I'm wondering how to set my ti 89 to ... " | x does not equal 3, and x does not equal 4 " for any partifular function... I tried a comma and a "|" still no go...

Just ordered one. How do you guys like yours? Seems like it is pretty badass and powerful. Is it any faster than the old ti-89?

I am having some problems with my Ti-89. I am familiar with all the settings under "Mode." However, when integrating the function 1/(sinx) the calculator returns the form "ln[(sinx)/(cosx-1)]" and NOT the form "ln[tan(x/2)]." I am completely unable to get the calculator to return the other...

I'm currently working with Fourier-series and have to integrate some expressions, like this one: 2\int_{0}^{1} (1-x)*sin(n \omega x) dx = 2 \left[- \frac{1}{n \pi}(1-x) cos(n \pi x) - \frac{1}{(n \pi)^2} sin(n \pi x) \right]_{0}^{1} = \frac{2}{n \pi} Trying to evaluate this (with \omega =...

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...

Messed up my TI-89 somehow, don't want to reset, any suggests for {}?? I don't know what I did, but now anytime my answer is going to be long, I get {} as an answer, nothing in between. Any thoughts? :( Angela.

I'm having some trouble solving inequalities with the TI-89. Let's say that I want to solve x^2<1 The answer should be <-1,1>, if I type in solve(x^2<1,x), but that's not what I get. It only returns the inequality itself just as I typed in. What's wrong??

Well, this August I will be an incoming freshman at college. I placed out of calculus 1 and 2, and will be starting with multivariable calculus, and then differential equations. I am well aware that professors do not allow the use of calculators on exams, but would still like to have one for...

I know I've posted this topic before, but does anybody know of any good TI-89 programming tidbits or programs themselves? Thanks