Question about Texas Instruments TI-84 Plus Calculator

# I tried to type in 2nd cos(3180.04) but it just says err. What do i do to fix this?

Posted by Anonymous on

• Level 3:

An expert who has achieved level 3 by getting 1000 points

Superstar:

An expert that got 20 achievements.

All-Star:

An expert that got 10 achievements.

MVP:

An expert that got 5 achievements.

• Texas Instru... Master

You are indeed committing an error. The sequence [2nd][COS] is activating the function arcosine or arccos or cos^-1, the inverse of the cosine function. If you remember the properties of the cosine functions, you know that cos(x) is defined over the real line ]- infinity to infinity[, but its range spans the interval [-1,1].
Since the arcosine function is the inverse of the cosine, its domain of definition is the range of the cosine, namely the closed interval [-1,1].

Thus if you enter [2nd][COS][3180.04] the calculator flags this as a domain error, because 3180.04 is outside the interval [-1,1]

Restrict the argument of cos^-1 to any value inside the closed interval [-1,1].
When manipulating the trigonometric functions and their inverses you must keep in mind that the results you get are dependent on the angle unit your calculator is configured for (deg, rad).

Posted on Jul 10, 2010

Hi,
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
Good luck!

Posted on Jan 02, 2017

×

my-video-file.mp4

×

## Related Questions:

### Sin, cos,tan don't work. For example, I click 1, 2nd and cos and I'm getting 1 instead of 0.54. In all other buttons the 2nd function is working but not for sin, cos, tan. Thanks for any help!

I wonder if your calculator is set to the wrong units. Your calculator can be set to degrees, radians, or gradians. I assume that you want it set to degrees.

When I click 1 2nd and cos, I will always get 0, because using the 2nd before the cos turns the function into cos^-1 (inverse cosine). The inverse cosine of 1 is 0 because the cosine of 0 is 1.

Good luck.

Let me know if you have any further questions.

Paul

Dec 20, 2015 | Texas Instruments BA II PLUS Financial...

### What is ERR: Domain on thr TI 84 graphing calculator?

The arccosine function is defined for arguments in the range -1 to +1. -125.85/-120.36 is larger than 1 and hence outside the domain of the arccosine function.

Dec 03, 2013 | Texas Instruments TI-84 Plus Calculator

### Enter sin cos tan

To access the inverse cosine function, press 2nd COS.

Oct 13, 2013 | Texas Instruments TI-82 Calculator

### Calculus cos^-1 Domain Error

If you're in the MATHPRINT mode, press
2ND [COS^-1] ( 8 - 3 2ND [sqrt] 2 1 right-arrow ) / 2 5 ENTER

If you're in the CLASSIC mode, press
2ND [COS^-1] ( 8 - 3 2ND [sqrt] 2 1 ) ) / 2 5 ENTER

Apr 27, 2013 | Texas Instruments TI-84 Plus Calculator

### How to find inv cos with ti-84 plus

Make sure the argument is between negative one and positive one, inclusive. The inverse cosine is defined only for arguments in that domain, anything else will give you a domain error.

Oct 26, 2011 | Texas Instruments TI-84 Plus Calculator

### When I press graph, it says "ERR: INVALID DIM" how

You're probably trying to graph a function that does not involve stat plot features. You can correct this by turning off the stat plot features. Press "2ND" "STAT PLOT" and then select 4:PlotsOff.

Jan 14, 2011 | Texas Instruments TI-84 Plus Calculator

### Whenever i type in 2nd cos(1301.16) and press enter, it tells me that i have a domain error? how can i fix this?

The key sequence [2nd] [Cos] calls the function arcosine or cos^-1. However that function takes its values in the range of the cosine function which is the interval [-1,1].
As you can see, your value of 1301.16 is clearly outside the interval [-1,1].

Dec 15, 2010 | Texas Instruments TI-84 Plus Calculator

### ERROR MESSAGE ON THE TI-83 TRYING TO GRAPH MESSAGE READS: ERR:MEMORY 1:QUIT CANT GET IT TO WORK ALREADY REPLACE ALL BATTERIES

To delete stuff from memory, press 2ND [MEM] 2 to display the Memory Management/Delete menu. Select the type of data you want to delete, or 1 for a list of variables of all types. Navigate through the list using up- and down-arrow and press DEL to delete the item from memory. Press 2ND [QUIT] to exit.

Feb 12, 2010 | Texas Instruments TI-83 Plus Calculator

### "Err: Domain"

I think you may find arcsin(x) is equivalent in older nomenclature to sin^-1 (x)...ie use the "2nd" and the SIN key instead of typing arcsin.
eg. arcsin(0.5) is 30 degrees is the same as sin^-1(0.5)
The ^-1 does not mean reciprocal, but "the angle whose sin is." Here the minus one indicates a kind of inverse operation. The word arcsin indicates that same inverse.

Mar 23, 2009 | Texas Instruments TI-89 Calculator

## Open Questions:

#### Related Topics:

462 people viewed this question

Level 3 Expert

Level 2 Expert