Question about Texas Instruments TI-84 Plus Calculator

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

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Posted on Jan 02, 2017

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

https://education.ti.com/en/us/guidebook/details/en/ADF11FB65B284B6195B0A7E9502784BA/baiiplus

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

https://education.ti.com/en/us/guidebook/details/en/ADF11FB65B284B6195B0A7E9502784BA/baiiplus

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

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

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

Oct 13, 2013 | Texas Instruments TI-82 Calculator

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

In either case you should get an answer of about 103.

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

In either case you should get an answer of about 103.

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

For example, type **[sin(5*pi/2)]^2**

See captured image

Jan 25, 2012 | Texas Instruments TI-85 Calculator

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

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

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].

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

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

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.

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

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