# TI-89 help

• Oct 28th 2007, 10:50 AM
jarny
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.
• Oct 28th 2007, 11:04 AM
galactus
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: \$\displaystyle 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: \$\displaystyle 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.
• Nov 29th 2007, 11:28 PM
jabroni1212
Quote:

Originally Posted by jarny
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.
• Apr 5th 2008, 08:01 AM
mx-
Quote:

Originally Posted by jabroni1212
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!
• Apr 6th 2008, 08:38 AM
Mathstud28
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