Question about Texas Instruments TI-89 Calculator

Divide 37 by 2 but then put a decimal after the two.

Posted on Aug 14, 2008

Easy! You can do either of the following:

(1) When you already have 37/2 as an answer... Press [F2] algebra, then go down 5: approx (, enter, and finally press in 37/2, enter again, and voila! 18.5....or type in approx(37/2)

(2) When you want your answer in decimal form, but don't want to break it down to two steps.... Press [your argument here] [green diamond button] [enter]

Posted on Jul 23, 2008

SOURCE: The "Tangent" button on the TI-89 calculator is

Make sure you're in the proper angular mode. You can see the angular mode by pressing the MODE key.

Posted on Feb 23, 2011

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Posted on Jan 02, 2017

The square root of 148 is 2*sqrt(37), the square of 3*sqrt(12) is 108, but that's not the point.

The TI-84 can't produce results like 2*sqrt(37). It can produce results as fractions but not involving roots. Some other machines, like the TI-89 can, but not the 84.

Sorry if that wasn't the answer you were hoping for.

The TI-84 can't produce results like 2*sqrt(37). It can produce results as fractions but not involving roots. Some other machines, like the TI-89 can, but not the 84.

Sorry if that wasn't the answer you were hoping for.

Nov 07, 2013 | Texas Instruments TI-84 Plus Silver...

Nothing's wrong, your calculator is giving you the cosine of 42 radians. If you want the cosine of 42 degrees (which is 0.74314), press MODE, down-arrow to the "Angle" line, press right-arrow, select "2:DEGREE", and press ENTER twice.

Dec 13, 2012 | Texas Instruments TI-89 Calculator

Try resetting your calculator
second->+->7

Mar 03, 2011 | Texas Instruments TI-89 Calculator

Make sure you're in the proper angular mode. You can see the angular mode by pressing the MODE key.

Jan 14, 2011 | Texas Instruments TI-89 Calculator

To convert a single answer, press the diamond key then ENTER. To have everything this way, press MODE F2 then scroll down to Exact/Approx and change the setting to APPROXIMATE.

Jun 23, 2010 | Texas Instruments TI-89 Calculator

Glad to be of help.

Feb 17, 2010 | Texas Instruments TI-89 Calculator

Here is what you do:

1) Press the Mode button.

2) Scroll down the list that appears until you find "Exact/Approx".

3) Change the setting for "Exact/Approx" to Exact.

4) Press enter to save the settings change.

You have three possible settings for "Exact/Approx":

1) Auto - The calculator will try to determine the best format.

2) Exact - The calculator will always give the answer in fraction form.

3) Approximate - The calculator will always give the answer in decimal form.

1) Press the Mode button.

2) Scroll down the list that appears until you find "Exact/Approx".

3) Change the setting for "Exact/Approx" to Exact.

4) Press enter to save the settings change.

You have three possible settings for "Exact/Approx":

1) Auto - The calculator will try to determine the best format.

2) Exact - The calculator will always give the answer in fraction form.

3) Approximate - The calculator will always give the answer in decimal form.

Nov 15, 2009 | Texas Instruments TI-89 Calculator

I had the same problem when I got my first 89, even though it's really a feature and not a problem.

Press the diamond key then enter to get your answer, and it will give you the decimal answer instead of the exact answer like you have been getting. Hope this helps...

Press the diamond key then enter to get your answer, and it will give you the decimal answer instead of the exact answer like you have been getting. Hope this helps...

Nov 15, 2008 | Texas Instruments TI-89 Calculator

Hello,

Your TI81 can only perform numerical calculation: It always give uour numbers. The TI89, a more sophisticated calculator, can of course do numerical calculation, BUT ALSO symbolic ones. You ask it for the derivative of sin(x) and it will give you cos(x).

Anyway, if you want a decimal result for you calculation above one of the numbers must have a decimal point (instead of writing 2PI write 2.PI.

The TI 89 can do exact calculations. But if you want approximate results any number in the sequence of operations must have the mark of a decimal. Numbers without decimal marks are considered integers, Integer numbers with a decimal mark are treated as floating point numbers ( meaning decimal).

Hope it clarifies things for you.

Your TI81 can only perform numerical calculation: It always give uour numbers. The TI89, a more sophisticated calculator, can of course do numerical calculation, BUT ALSO symbolic ones. You ask it for the derivative of sin(x) and it will give you cos(x).

Anyway, if you want a decimal result for you calculation above one of the numbers must have a decimal point (instead of writing 2PI write 2.PI.

The TI 89 can do exact calculations. But if you want approximate results any number in the sequence of operations must have the mark of a decimal. Numbers without decimal marks are considered integers, Integer numbers with a decimal mark are treated as floating point numbers ( meaning decimal).

Hope it clarifies things for you.

Nov 15, 2008 | Texas Instruments TI-89 Calculator

Angle mode, Degree/radian setting, Chapter 2, pg 53 (pg70 of 623)
Tan instructions pg 510 (appendix A pg 527 of 623)
Here's your manual, download this file:
http://www.ti-89.org/uploads/ti-89-manual.pdf

Jun 07, 2007 | Texas Instruments TI-89 Calculator

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