Question about Texas Instruments TI-89 Calculator

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TI-89 Problems When i go to do a cos, tan, sin function or add an exponent (ie. 2^2) the calculator wont answer me. It just repeats what i have typed into it on the main screen without actually doing the tan function or squaring the number. Please help me. Is there something i need to change in the settings? Basically it just wont solve things and repeats what i have typed in right back to me. Basic functions like plus and minus work but that is about it.

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There isn't anything "wrong" with it.

Go to mode, and set the results of your inquiries from Exact to approx.

If you put in cos(e^2), it will print out cos(e^2) because it's the most exact it can be without going into a decimal. (cos(e^2) will be a transcendental number like Pi).

Posted on Dec 21, 2008


Go into mode and scroll down to exact/approximate.The sin/cos etc functions will give you an exact answer, unless you set it to approximate which is what I am guessing you are looking for.

Posted on Sep 11, 2007


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How do i enter this question on a ti 89? 5 sin(2 pi 2000 t +60 degrees) does anybody know i would appreciate it.

Hi ssmith63,
Put the calculator in radian angle mode. The top answer is in AUTO mode and, The bottom is in Approx mode.

I converted 60 degrees into pi/3 radian which equals 1.0472 radians. I figured 5 significant digits was good enough since, you only went 4. If you have any question just post them and, I'll respond quickly.

Jan 15, 2011 | Texas Instruments TI-89 Calculator

3 Answers

TI89 is giving wrong answer for the integral of sec(x). Please help. It gives the answer as: ln[ |cos(x) / (sin(x)-1)| ] when it should be ln[ |(sin(x)-1) / cos(x)| ]. Why is it giving the wrong...

Hi danagasta,

If my last instructions did not work then you need to reset your RAM. You are missing the negative sign and, I have no idea where you got the absolute value inside the brackets.
Yes, the absolute value are used in books and, on integral tables but, I can asure you that the Ti 89 should not have produce them in this answer.

I'll stand behind that In( -cos(x) / (sin(x)-1)) is the correct answer. You can go ahead and simplify after the calculation to get the answer you want but, that is the good answer that Ti 89 is going to give you for the integral of sec(x).

Errors that do not match the suspected, I am pretty sure that Texas Instruments would have you clear the RAM. I do not like resetting the RAM but, I could not find the cause to why you got the answer you did. And so far no other expert has produced a solution to convince me otherwise.

I was not able to come up with any of the 3 answers MiB8888 did on my Ti 89. I am not saying that they are not good answers, they are book and integral tables answers. You are not going to get them on the Ti 89.

Jan 04, 2011 | Texas Instruments TI-89 Calculator

1 Answer

My TI-89 Titanium won't graph sin, cos, or tan?

Set your calculator to RAD mode and then graphing functions.
See example for y=sin x


Nov 10, 2010 | Texas Instruments TI-89 Calculator

1 Answer

My TI-89 won't solve for sin, cos, or tan. I can type in: sin(127) but instead of an answer it gives me sin(127) again. can someone please tell me how to fix this so that I can do my precalc homework?

Press diamond ENTER to convert the result to numeric form.

To have everything come out numeric, press MODE F2 then down-arrow down to Exact/Approx, then right-arrow and select APPROXIMATE. Press ENTER to set the choice, then ENTER again to save and exit.

Sep 21, 2010 | Texas Instruments TI-89 Calculator

1 Answer

I cannot figure out how to do a problem with arc on my ti-83

Sorry but you are not been very clear.
Are you doing some kind of geometry or trying to use the inverse trigonometric functions such as arccos, arcsin, arctan?

If you are doing geometry you should specify what application you are using.

If it concerns the trigonometric functions, on the TI83/TI83Plus these functions are represented as cos^-1, sin^-1, tan^-1.
To access them you press the 2nd (orange/yellow) then cos, sin or tan.

A word of caution:When using any trigonometric function make sure your calculator is configured with the correct angle unit ( degree or radian) your problem calls for.

Good luck,

Hope it helps.

Jun 24, 2009 | Texas Instruments TI-89 Calculator

1 Answer

TI-84 Plus silver edition sin/cos/tan

for function = (sin,cos,tan,sec,cosec,cotan)
arc(function) = function^-1, calculated in the first quadrant for simplicity(0-pi/2) (0-90deg), as all functions repeat circularly
just another method of notation

Jun 19, 2008 | Texas Instruments TI-84 Plus Silver...

1 Answer


The answer that you have received in actuality is correct. However, it is in exact form when the answer that you were looking for was an approximation (decimal form) answer. To achieve this all you have to do is hit the alpha button (the yellow button with a diamond in the center) and then enter which will give you your desired answer :-)

Jan 14, 2008 | Texas Instruments TI-89 Calculator

4 Answers

Cosh Squared or Cubed

if you want to square sin(3), press:


Sep 24, 2007 | Texas Instruments TI-89 Calculator

16 Answers

Need help withe the sin, cos, tan problem with ti - 83 plus

here are the steps in changing it from radian to degrees
1. turn on your TI-83 plus
2. press the MODE button near the top of your calculator
3.go down to options and move the highlight from radian to degree, press enter and clear
you're good to go

Feb 17, 2007 | Texas Instruments TI-83 Plus Calculator

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