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Question about Texas Instruments TI-89 Calculator

# TI-89 I am having a difficult time getting my calculator to give me appropriate answers when using the tan key. I have read that my problem could be from having the calculator set in radians instead of degrees. I cannot seem to figure out how to change this setting. It has been MANY years since I have really used most of the functions with this calculator...please give step by step instructions. Thank you.

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### Anonymous

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To change between degrees/radians::: . [MODE]  Arrow down to "Angle....."  Arrow [>] to open the selector Arrow up/down to pick one Then click [ENTER] . Another TIP: make sure you use brackets correctly. i.e. tan x^3-x^2+9.5 is not the same as tan(x^3+x^2+9.5) or tan(x^3+x^2)+9.5 (  that first one actually tells the calculator tan(x^3) - x^2 + 9.5  ) . Hope this helps :)

Posted on Feb 11, 2009

### Anonymous

How to find the intergration in TI-89

Posted on Apr 17, 2008

### Anonymous

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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

Posted on Jun 07, 2007

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### Anonymous

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You have to set how the calculator handles angles. To do this follow these steps: 1. Press the 'MODE' button. This brings up the calculator's main settings page. 2. Scroll down until you reach a field titled 'Angle...'. This is the setting for how the calculator handles angles, whether it will show angle answers in degree or radian format. 3. Press the right arrow which will bring up the options for that setting. You must now choose between the two ways of handling angles: -'1:RADIAN' will display angle answers in radians. -'2:DEGREE' will display angles is degrees. 4. After you have selected one of those options pres enter one more time to get out of the 'MODE' dialogue and return to the 'HOME' screen. Now try a problem and see what happens.

Posted on Oct 07, 2007

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## Related Questions:

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Enter the first term as (-20^2), not as -20^2. Without the parentheses the calculator interprets it as
-(20^2), which is not what you want.

Also, make sure you use the (-) key just to the right of the decimal point and not the - key.

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First, make sure you have the appropriate angular mode set. To change the angular mode, press MODE, use the arrow keys to highlight either "RADIAN" or "DEGREE" on the third line, press ENTER, then press 2ND [QUIT].

Press the appropriate sin, cos, or tan key (two rows above the 7, 8, and 9 keys), enter the angle, close the parenthesis, and press ENTER. For example, to calculate the sin of 2.1, press
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Your calculator is set to radians. To set it to degrees, press MODE, use the arrow keys to move to the "Angle" line, press right-arrow, press 2, then press ENTER.

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Make sure you have the proper angular mode set. The TI-84 can work with degrees or radians.

Press MODE to bring up the mode screen. Use the arrow keys to highlight either "Radian" or "Degree" on the third line and press ENTER. Press 2ND [QUIT] to exit the mode screen.

If this doesn't do it, please reply to this post giving an example of a calculation and the answer you're getting from the calculator.

### 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.

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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.

### When I turn the switch on, ti-89 titanium does not turn on.

If you connect calculator to computer using Ti connect device explorer you might be able to see what files are on the calculator. I don't know if you downloaded from the web but, 3rd party programs and shells tent to miss up the calculator. This would able you to delete out possible problems which could be re installed later.

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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...

First you're going to want to navigate to the Home icon that is on the main screen by using the arrow keys, then once you press enter you will arrive at a different screen and you will be able to enter numbers and symbols at that screen. once you press the appropriate keys for your math problem you will then want to check over that problem and once it is what you want you will then want to press the enter key. The answer should come up. If you do a division problem though, it will just give you a fraction, to get a decimal answer you will then want to press the green diamond key and then the enter key in one extra keystroke to get your final useful answer.

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