# TI84+ better than a TI89 Ti ??

• Apr 12th 2009, 04:44 PM
omnivore
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!(Headbang)
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?

PS: It would be great if somebody using a TI89 could solve the above expression and see how long it takes...
• Apr 12th 2009, 06:20 PM
Reckoner
Quote:

Originally Posted by omnivore
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($\displaystyle \sqrt{}$(x)+x),x,0,60)
If you use the regular integration function, $\displaystyle \mbox{$\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.
• Apr 12th 2009, 06:40 PM
omnivore
Quote:

Originally Posted by Reckoner
Mine took 28 seconds. If you use the regular integration function, $\displaystyle \mbox{$\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(Thinking)
• Apr 12th 2009, 06:53 PM
Chris L T521
Quote:

Originally Posted by omnivore
Its a pity i cant use them in the exams though(Thinking)

But you can use it on the exam... (Giggle)