Question about Texas Instruments TI-89 Calculator

# When I attempt a hyperbolic function of a complex number on my TI-89 titanium I get a domain error. Why is this?

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Posted on Oct 08, 2016

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Have you checked the calculator's manual to see if the calculator is able (natively) to handle functions of a complex argument. It is able to handle simple algebra with complex numbers, powers, roots, solving a polynomial equation.
For this calculator, the hyperbolic functions must have a real argument otherwise you get a domain error. But just to make sure, try the exponential function with i (imaginary unit) as argument. If it comes back with a domain error you have your answer.

Posted on Apr 09, 2011

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Posted on Jan 02, 2017

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## Related Questions:

### "Undefined" as answer to an inverse sine calculation

I suspect that you are confusing things a bit.
The inverse sine, called the arcsine is a function defined in the closed interval [-1,1]. And so is the inverse cosine. Any value outside this interval will give you a non-real result (meaning a complex one).
There are no limitations on the domain of definition of the inverse hyperbolic sine or sinh^-1
If your input value is allowed to be complex, the arcsine function gives a complex value. See the screen capture

Mar 17, 2014 | Texas Instruments TI 89 Titanium Graphing...

### I am trying to enter a exp to an complex number and am getting a domain error. How do I clear it up

You got a domain error because your angle unit is not set to radians.
Change the angle unit in the MODE configuration screen. In the following screen I calculated the same expression under EXACT and APPROXIMATE calculation formats.

Jan 23, 2012 | Texas Instruments TI-89 Calculator

### I am trying to enter a exp to an complex number and am getting a domain error. How do I clear it up

Domain error occurs if you using polar form of complex numbers in Degree or Gradian angle units.
You have to set up Radian mode and then input complex value. See captured images

Jan 23, 2012 | Texas Instruments TI-89 Calculator

### I am trying to enter a exp to an complex number and am getting a domain error. How do I clear it up

At first, you can enter a complex number in r*exp(i*theta ) form. This is exponential form of complex number. However, use this form in Radian angle mode only. It causes a Domain error in Degree or Gradian angle mode. To resolving this problem type Mode then F1 and set up Radian mode

Jan 23, 2012 | Texas Instruments TI-89 Calculator

### When I attempt to use hyperbolic functions for complex numbers i get a domain error

Have you checked the calculator's manual to see if the calculator is able (natively) to handle functions of a complex argument. It is able to handle simple algebra with complex numbers, powers, roots, solving a polynomial equation.
For this calculator, the hyperbolic functions must have a real argument otherwise you get a error. But just to make sure, try the exponential function with i (imaginary unit) as argument. If it comes back with a domain error you have your answer.

Apr 06, 2011 | Texas Instruments TI-89 Calculator

### Ti-89 titanium

Having gone over a month with no response, I assume this is no longer a problem.

Jun 26, 2010 | Texas Instruments TI-89 Calculator

### "domain error" message on ti-89 titanium

I had the same problem, this worked for me:

Mode -> page 2 -> Exact/Approx change from "Exact" -> "Auto"

May 12, 2008 | Texas Instruments TI-89 Calculator

### "domain error" message on ti-89 titanium

An argument must be in a specified domain. For example, ans(100) is not valid because the argument for ans() must be in the range 1–99.

May 11, 2008 | Texas Instruments TI-89 Calculator

### Dec to hex conversion

Not sure if TI-89 mode keys are the same, but here's the solution for that calculator:
1. Hit the mode key
2. Hit F3 to get tot Exact/Approx (might be different for 89T).
3. Set it to Exact.
4. Take a look at T-89 manual pages 327, 328, 329.
Nice of TI to NOT include that in the manual, huh?

Dec 13, 2007 | Texas Instruments TI-89 Calculator

I have a TI-89 Titanium and I have experienced the same problem. HERE IS HOW TO FIX IT:

Goto " MODE " and scroll down the options until you get to
" COMPLEX FORMAT " change that option to " RECTANGULAR " and press ENTER until you exit out of the " MODE " screen. (very important that you press ' enter ' until you exit because if you don't, it will not save your changes. )

Sep 19, 2007 | Texas Instruments TI-89 Calculator

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