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Math Help - TI-89 help

  1. #1
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    TI-89 help

    Can someone tell me how to find the following on the T1-89(titanium) calculator: (in this way please, for example the first derivative is d(f(x),x)).): a derivative implicitly, an nth derivative, limits (one sided and full), and can u tell me if it's possible to make the ti give me decimals? i hate carrying around an 89 for calc and 84 for statistics. Thanks alot.
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  2. #2
    Eater of Worlds
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    All of this is in the manual or online.


    For implicit diff, look for ImpDif under the calc menu.

    For a second derivative, after the x,type the number corresponding to the nth derivative.

    example: d(x^{2},x,\boxed{2}) will give the second derivative. Just enter 3,4,5, etc for any other derivatives.

    For one-sided limits, if you want right, enter in 1. For left, enter -1.

    example: left-sided limit, approaching 0 from the left: limit(sin(x)/x,x,0,\boxed{-1})


    And of course it'll give decimals. Set it to 'approx' mode or just press the green key and then enter.
    Look above your ENTER button. Is there a squiggly looking equal sign?. That means approximate.
    Last edited by galactus; November 24th 2008 at 06:38 AM.
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  3. #3
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    Quote Originally Posted by jarny View Post
    and can u tell me if it's possible to make the ti give me decimals?
    Another easy way to make the 89 give you decimals is type a decimal into any of the numbers you type in. For example if you type 1/4 it will give you 1/4, if you type 1./4 it will give you 0.25. This is of course a temporary solution, but better if you want decimals only sometimes.
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  4. #4
    mx-
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    Quote Originally Posted by jabroni1212 View Post
    Another easy way to make the 89 give you decimals is type a decimal into any of the numbers you type in. For example if you type 1/4 it will give you 1/4, if you type 1./4 it will give you 0.25. This is of course a temporary solution, but better if you want decimals only sometimes.
    You can set the dec setting in "MODE" under "Exact/Approx"
    The three options there are:
    Auto - Will return the answer depending on the format you entered.
    Exact - Will give answers in fractions
    Approx - Will always return a dec

    PS. To make the TI return a dec, Hit <> (Diamond) + ENTER. Instead of just Enter!
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  5. #5
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    Apparently noone knows

    that if you push the yellow button with the black triangle in it before you push enter it gives you a decimal...this is true for the Titanium edition
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