Ti-89 Definition and 167 Threads

  1. C

    Calculators Integrating with Constant Variables: TI-89 Symbolic Integration

    How can I integrate an expression with constant variables like needed when solving m\frac{dv}{dt} = mg but assuming I don't know its value?
  2. C

    Calculators TI-89 Exact/Approx Answers: How to Get Approximate Results with "AUTO" Mode

    With the Exact/Approx set to "AUTO" in the mode menu, how can I get approximate answers without going and switching it to approx then recalculating?
  3. V

    Calculators Using TI-89 Plus or computer-based packages to get the moment of inertia

    can anyone suggest ways on how to calculate the moment of inertia using: 1) graphics calculator [TI-89 plus] and/or 2) any computer-based packages for a cylinder, cone and sphere? I believe that a program can be created in my graphics but i don't seem know how to create such a complicated...
  4. A

    Calculators Did my TI-89 calculator's pixels die due to age or heat?

    A whole row of pixels just mysteriously disappeared while I was using my calculator. Age maybe? It's about three years old.
  5. T

    Calculators How can I solve inequalities with a TI-89?

    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?
  6. P

    Calculators Programming Hot Key for TI-89 Log Function

    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
  7. A

    Calculators Graphing ODE Integral Curves on the TI-89

    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.
  8. M

    Calculators Ti-89 Titanium at bestbuy for 119.99

    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...
  9. E

    Calculators Solving for x with a Ti-89: Excluding 3 & 4

    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...
  10. L

    Calculators Just Ordered a TI-89: How Does it Compare to the Old Model?

    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?
  11. M

    Calculators How Can I Change Integration Form on 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...
  12. T

    Calculators Troubleshooting Fourier & TI-89 Integration

    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 =...
  13. F

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

    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...
  14. A

    Calculators Messed up my TI-89 somehow, don't want to reset, any suggests for {}?

    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.
  15. T

    Calculators Why Doesn't My TI-89 Solve Inequalities Correctly?

    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??
  16. N

    Calculators Which calculator to get? Ti-89, or HP49G+?

    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...
  17. S

    Calculators TI-89 Programming: Tips & Programs

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