Question about Texas Instruments TI-84 Plus Calculator

# How do i get inv on my TI-84 Plus caculator

Im in trigonometric functions right know how do i find inv on my TI-84 caculator

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### kakima

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To get the inverse trigonometric functions press the 2nd key then the trig function key. If you'll look at the key legends above the SIN, COS, and TAN keys you'll see the standard math notations for their inverse function.

Posted on Apr 05, 2012

### kakima

Try the 2ND key instead of INV.

Posted on Feb 18, 2010

### k24674

Turn StatPlotsOff to avoid errors:
Press [2nd][STATPLOT][4:PlotsOff][ENTER].

1. Verify that in [MODE] Func is highlighted.
2. If it is not, use arrow to highlight Func and press [ENTER[ to validate.
3. Press [Y=] and type in the functions.
4. Press [ENTER] at the end of each function.
5. Before pressing [GRAPH], make sure that all the = signs that define the functions to be graphed are highlighted white on black. If one is not highlighted, use arrow to move cursor on the sign and press [ENTER].
6. Select the graph styles: The small piece of line to the left of a Y that defines a function is the style. Move cursor on it and press [ENTER] . Each [ENTER] (on same line) selects another style.
7. Press [GRAPH] to see the graphs.
8. If one of them is missing, verify that its = is still highlighted, then use the [WINDOW] to set the Window dimensions, or the [ZOOM] to adjust.

Posted on Mar 10, 2010

### kakima

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.

Posted on Oct 26, 2011

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## Related Questions:

### Domain error when I try to graph trigonometric functions

Possible: Inverse trigonometric functions have limited domains. For arcsine and arccosine it is between -1 and 1.

Feb 09, 2014 | Texas Instruments Ti-84 Plus C Silver...

### My TI-84 Plus won't let me graph trigonometric functions.

Is it somehow preventing you from graphing, or are you simply not getting the graph you expect?

Most likely you have the angular mode set wrong. You probably want it set to radians. Press MODE, move to the third line, highlight RADIAN, press ENTER, then 2ND [QUIT].

If it's not the angular mode, please reply to this post and give an example or two.

Mar 22, 2013 | Texas Instruments TI-84 Plus Calculator

### I can not find the arc key or the INV key

The INV key that you may find on some scientific calculators has, on the TI 83/84/ Plus calculators, an equivalent key marked [2nd].

On the TI83/84 Plus, each trigonometric function has a second marking [SIN^-1], [COS^-1] or [TAN^-1]. To calculate the inverses of trigonometric functions ( arc sine, arc cosine, arc tangent) you press [2nd] followed by the relevant trigonometric function key For example, [2nd] [SIN] displays sin^-1( on the command line.

Unfortunately the hyperbolic functions and their inverses are only accessed through the CATALOG. You press [2nd][0] to open the CATALOG. Then you scroll down the CATALOG list to reach cosh(, cosh^-(, sinh(, sinh^-1(, tanh(, or tanh^-1(.
To speed the search in the catalog, you use the ALPHA keyboard: To reach cosh(, press[PRGM] and you scroll down from there.

Feb 27, 2012 | 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

### How can I graph sine and cosine waves on my TI-84 Plus? I can see the Theta symbol on the "X,T, "Theta",n" button. But whenever I try to graph a function, it doesn't work. Please...

When you graph functions y=f(x), even if f(x) is a trigonometric function, the default independent variable is x. You will have to use the variable theta only when drawing polar functions.
To draw the sine and cosine or any other trigonometric function set the angle unit to radians and window zoom to standard. If your angle unit is degree you must modify the x-window range to, say, multiples of 180 degrees. Other than that there is nothing special to do. The functions are well-behaved and should graph nicely. You will alos get a better view if Ymin is about -1.2 and Ymax is about 1.2

May 22, 2011 | Texas Instruments TI-84 Plus Calculator

### Everytime i try to graph i get an error saying invalid dim on my 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.

May 19, 2010 | Texas Instruments TI-84 Plus Calculator

### How to use graphing caculator, TI 84?

Turn StatPlotsOff to avoid errors:
Press [2nd][STATPLOT][4:PlotsOff][ENTER].
1. Verify that in [MODE] Func is highlighted.
2. If it is not, use arrow to highlight Func and press [ENTER[ to validate.
3. Press [Y=] and type in the functions.
4. Press [ENTER] at the end of each function.
5. Before pressing [GRAPH], make sure that all the = signs that define the functions to be graphed are highlighted white on black. If one is not highlighted, use arrow to move cursor on the sign and press [ENTER].
6. Select the graph styles: The small piece of line to the left of a Y that defines a function is the style. Move cursor on it and press [ENTER] . Each [ENTER] (on same line) selects another style.
7. Press [GRAPH] to see the graphs.
8. If one of them is missing, verify that its = is still highlighted, then use the [WINDOW] to set the Window dimensions, or the [ZOOM] to adjust.

Mar 10, 2010 | Texas Instruments TI-84 Plus Calculator

### Some of my class set of Ti - 84 silver aren't computing sine and cosine correctly. I've tried clearing RAM and looked at settings. Please help!

I have answered many questions asked by teachers and professors, and very few, if any, deigned to rate the posts. Why do I set myself up for yet another disappointment: I just like to help.

Anyway, the most common source of errors with computation of trigonometric functions is the angle unit. On Ti 83/84Plus (SE) calculators there are two angle units: the degree and the radian.

To verify which angle unit is set as default on a calculator, press MODE. You will see the following screen. The relevant line is the 3rd. On the screen RADIAN is highlighted, meaning that all angle values you feed to trigonometric functions are interpreted as radian measures.
Similarly, all values returned by inverse trigonometric functions are in radians.

I do not know what grades you teach, but if you are doing any differential calculus, the only appropriate unit is the radian. Only for the radian unit is the derivative of sin(x) equal to -cos(x). For the degree, you must introduce a factor to adjust (as a change of variable).

Set all your calculators to use the angle unit you are using in your teaching, and there will be no unexpected results.

Mar 09, 2010 | Texas Instruments TI-84 Plus Silver...

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