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Math Help - TI84+ better than a TI89 Ti ??

  1. #1
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    TI84+ better than a TI89 Ti ??

    Hello people,
    I'm a high school student currently doing AP Calculs. Uptill now i was using a TI86 to solve problems, most people in my class use a TI84+, and i noticed that my calculator was pretty slow compared to theirs.
    For Example, integrating the expression: cos(sqrt(x)+x),x,0,60 (in radian mode) use to take almost 2 min to calculate (ans is -1.19075).
    Nyways, the point is, now i use a TI89 Titanium, which is faster than the TI86 in the sense that it takes about a min to solve the above expression. Wat suprisses me is that a TI84+ only takes 10 seconds!
    Does anyone know why is it like this or is their a problem with my calculator? also i dont hav a lot many apps and stuff installed. Can the battery be the problem?
    Thaks in advance.

    PS: It would be great if somebody using a TI89 could solve the above expression and see how long it takes...
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  2. #2
    MHF Contributor Reckoner's Avatar
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    Quote Originally Posted by omnivore View Post
    PS: It would be great if somebody using a TI89 could solve the above expression and see how long it takes...
    Mine took 28 seconds. The input was
    Code:
    nInt(cos(
    
    
    
    
    \sqrt{}(x)+x),x,0,60)
    If you use the regular integration function, \mbox{$\int$}(), it will take longer since the calculator will first try to integrate the expression symbolically.

    And this answers the question in your title: the TI-89 can do symbolic manipulation; the 84+ cannot. Personally, being able to do symbolic integration is much more important to me than having slightly faster numeric integration.
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  3. #3
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    Quote Originally Posted by Reckoner View Post
    Mine took 28 seconds. If you use the regular integration function, \mbox{$\int$}(), it will take longer since the calculator will first try to integrate the expression symbolically.
    Thanks Reckoner! that answered the other question i had. i tried using nInt and it took about the same time as yours which is pretty reasonable.

    Also, i agree with you about the part that its beter to have more features than just speed. Its a pity i cant use them in the exams though
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  4. #4
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by omnivore View Post
    Its a pity i cant use them in the exams though
    But you can use it on the exam...
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