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Interactive Manual › Chapter 15

Chapter 15: CATALOG, Strings, Hyperbolic Functions

Browse the alphabetical CATALOG of every function and instruction, enter strings and store them in Str0–Str9, use the six string functions (Equ►String(, expr(, inString(, length(, String►Equ(, sub() and the six hyperbolic functions.

Browsing the TI-84 Plus CATALOGp. 266

The CATALOG is one long alphabetical list of every function and instruction on the calculator. Anything you cannot find on a key or in a menu can be pasted from here. This chapter then covers the two groups of functions that live only in the CATALOG: strings and hyperbolic functions.

What Is the CATALOG?p. 266

Almost every item in the CATALOG can also be reached from a menu or a key. These are the exceptions, so for them the CATALOG is the only route:

  • The six string functions: Equ►String(, expr(, inString(, length(, String►Equ( and sub(.
  • The six hyperbolic functions: sinh(, cosh(, tanh( and their inverses sinh⁻¹(, cosh⁻¹(, tanh⁻¹(.
  • The solve( instruction, unless you are in the equation solver editor (see Chapter 2).
  • The inferential statistics functions, unless you are in an inferential stat editor (see Chapter 13).
Note The only programming commands from the CATALOG that you can run directly from the home screen are GetCalc(, Get( and Send(. Other programming commands can be pasted there but are meant for use inside programs.
Note GetCalc(, Get( and Send( exchange data over the calculator link cable. The emulator has no link port, so they have nothing to talk to here.

Selecting an Item from the CATALOGp. 266

Press 2ndCATALOG to open the CATALOG. A ► marker in the first column is the selection cursor. Scroll with ▼︎ and ▲︎ until it points at the item you want, then press ENTER to paste that item at the cursor on the screen you came from.

The CATALOG is long, so alpha-lock is already on when it opens. Press a letter key and the cursor jumps to the first item that starts with that letter. Then scroll the rest of the way with ▼︎.

  • Items that start with a digit are filed under the first letter after the digit. For example 2-PropZTest( is among the items that start with P.
  • Items that are symbols, such as +, ⁻¹, < and √(, come after the last item that starts with Z. To jump to the first symbol, !, press the θ letter, ALPHAθ.
  • From the first item, ▲︎ wraps around to the very last item. From the last item, ▼︎ wraps to the first.
CATALOG 2ndCATALOG
►abs(First item; the list opens here. Alphabetical from A to Z.
Letter keyJumps to the first item starting with that letter (alpha-lock is on).
ENTERPastes the item at the cursor on the previous screen.
θJumps to the first symbol item, !, which follows the Z items.
Note In MathPrint mode, many functions paste their 2D template instead of plain text. For example abs( pastes the absolute value template on the home screen. In Classic mode you get the ordinary abs( text.
Tutorial

Paste abs( from the CATALOG

The first item in the list is abs(, so it is the quickest one to try.

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Open the CATALOG. The cursor starts on the first item.
    2ndCATALOG
  2. Press ENTER to paste abs( on the home screen.
    ENTER
  3. Type the argument, negative five, and evaluate.
    (−)5ENTER
Tutorial

Jump to a letter and scroll

Find the string function length( by jumping to L, then scrolling.

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Open the CATALOG.
    2ndCATALOG
  2. Press the letter L. The cursor jumps to the first item starting with L.
    ALPHAL
  3. Scroll down four items to length(.
    ▼︎▼︎▼︎▼︎
  4. Paste it, type the string HELLO in quotation marks, close the parenthesis and evaluate.
    ENTERALPHA"ALPHAHALPHAEALPHALALPHALALPHAOALPHA")ENTER
Tutorial

Items that start with a number

Items such as 2-PropZTest( are filed under the first letter after the digit.

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Open the CATALOG and jump to P. The first P item is Param.
    2ndCATALOGALPHAP
  2. Scroll down through the P items. Among them are the ones that begin with the digit 2, such as 2-PropZTest(, filed here under P for PropZ.
    ▼︎▼︎▼︎
  3. Press CLEAR to leave the CATALOG without pasting anything.
    CLEAR
Tutorial

Symbols and wrap-around

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Open the CATALOG. Press the θ letter (ALPHAθ) to jump to the first symbol item, !.
    2ndCATALOGALPHAθ
  2. Close the CATALOG and reopen it so the cursor is back on the first item. Press ▲︎ once: from the first item the cursor wraps to the very last one.
    CLEAR2ndCATALOG▲︎
  3. Press ▼︎: from the last item the cursor wraps back to the first.
    ▼︎

Entering and Using Stringsp. 267

Strings let you work with text. This section covers what a string is, how to type one, how to keep it in a string variable, and the functions that work on strings.

What Is a String?p. 267

A string is a sequence of characters between quotation marks. In programs, strings serve two main purposes: they hold text to display, and they hold what the user types in at the keyboard.

The characters are the units that make up a string:

  • Each digit, letter and space counts as one character.
  • Each instruction or function name, such as sin( or cos(, also counts as one character, because the calculator stores it as a single token.
Note A string must be enclosed in quotation marks, but the quotation marks themselves do not count as characters of the string.

Entering a Stringp. 267

To enter a string on a blank line on the home screen, or in a program:

  1. Press ALPHA" to type the opening quotation mark ".
  2. Type the characters. You can mix digits, letters, function names and instruction names. Press ALPHA␣ for a blank space. To type several letters in a row, press 2ndA-LOCK to turn on alpha-lock.
  3. Press ALPHA" again to type the closing quotation mark. (The closing quote is optional before ENTER or STO►.)
  4. Press ENTER. On the home screen, the string appears on the next line without its quotation marks. If it is too long for the screen, an ellipsis ... at the end shows that it continues; press ▶︎ and ◀︎ to scroll through it.
"HELLO"
HELLO
Classic: the string you typed, then the result without quotation marks.
Tutorial

Enter the string HELLO

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Press ALPHA" to type the opening quotation mark.
    ALPHA"
  2. Type the letters H, E, L, L, O. Each letter is ALPHA plus the key that carries the green letter.
    ALPHAHALPHAEALPHALALPHALALPHAO
  3. Type the closing quotation mark.
    ALPHA"
  4. Press ENTER. The string is shown on the next line without quotes.
    ENTER
Tutorial

Enter a string with a space

A space is its own character, typed with ALPHA␣.

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Type the opening quote, then HI.
    ALPHA"ALPHAHALPHAI
  2. Press ALPHA␣ for a blank space, then type THERE and the closing quote.
    ALPHA␣ALPHATALPHAHALPHAEALPHARALPHAEALPHA"
  3. Press ENTER.
    ENTER
Tutorial

Type letters with alpha-lock

When you have several letters in a row, alpha-lock saves pressing ALPHA each time.

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Type the opening quote. Then press 2ndA-LOCK to switch alpha-lock on.
    ALPHA"2ndA-LOCK
  2. With alpha-lock on, just press the keys that carry H, E, L, L and O.
    ^SIN))7
  3. Press + for the closing quote (it carries the " letter), then ALPHA to turn alpha-lock off.
    +ALPHA
  4. Press ENTER.
    ENTER

Storing Strings to String Variablesp. 268

Strings you want to keep go into string variables. You can use these in the string functions and instructions later.

String Variablesp. 268

The calculator has ten string variables, Str1 through Str9 and Str0. To reach them, press VARS, then choose 7:String… (press 7 or highlight it and press ENTER). The STRING menu appears.

VARS 7:String… (STRING) VARS7
1:Str1String variable 1
2:Str2String variable 2
3:Str3String variable 3
4:Str4String variable 4
5:Str5String variable 5
6:Str6String variable 6
7:Str7String variable 7
8:Str8String variable 8
9:Str9String variable 9
0:Str0String variable 0
Tutorial

Open the STRING menu

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Press VARS to open the VARS menu. Item 7 is String….
    VARS
  2. Press 7 to open the STRING menu. Str1 to Str9 and Str0 are listed.
    7
  3. Press CLEAR to close the menu without choosing anything.
    CLEAR

Storing a String to a String Variablep. 268

  1. Type the string between quotation marks, with ALPHA" at each end.
  2. Press STO►.
  3. Press VARS7 to open the STRING menu.
  4. Pick the string variable to receive it, Str1 to Str9 or Str0. It is pasted after the store arrow →.
  5. Press ENTER. The stored string appears on the next line without quotation marks.
Tutorial

Store "HELLO" in Str1

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Type the string HELLO between quotation marks.
    ALPHA"ALPHAHALPHAEALPHALALPHALALPHAOALPHA"
  2. Press STO► to start the store.
    STO►
  3. Open the STRING menu.
    VARS7
  4. Choose 1:Str1. It is pasted after the arrow.
    1
  5. Press ENTER to store it. The string appears below.
    ENTER

Displaying the Contents of a String Variablep. 269

To see what a string variable holds, paste its name from the STRING menu and press ENTER. The string is displayed on the next line.

Tutorial

Display the contents of Str1

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Open the STRING menu and choose 1:Str1.
    VARS71
  2. Press ENTER. The contents are shown.
    ENTER

String Functions and Instructions in the CATALOGp. 269

The string functions and instructions are available only from the CATALOG. Select them as described in Selecting an Item from the CATALOG. The sections below describe each of them, and also how to join strings together.

Displaying String Functions and Instructions in the CATALOGp. 269

This table lists the six string items in the order they appear among the other CATALOG items.

CATALOG itemWhat it does
Equ►String(Converts an equation to a string.
expr(Converts a string to an expression and runs it.
inString(Returns the position of a character or substring.
length(Returns the number of characters in a string.
String►Equ(Converts a string to an equation.
sub(Returns part of a string as a string.
Tip Quick finds in the CATALOG: Equ►String( is 3 items below the E jump, expr( is 4, inString( is 6 below the I jump, and length( is 4 below the L jump.

Concatenationp. 270

To concatenate (join) strings, put + between them. Each piece can be a quoted string or a string variable. Chain as many as you need:

string1+string2+
string3...

Press ENTER to see the strings displayed as a single string.

Tutorial

Concatenate two string variables and a space

Str1 holds HELLO and Str2 holds WORLD. You will join them with a space between.

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Paste Str1.
    VARS71
  2. Press +, then type a space between quotation marks.
    +ALPHA"ALPHA␣ALPHA"
  3. Press + and paste Str2.
    +VARS72
  4. Press ENTER. One combined string appears.
    ENTER

Selecting a String Function from the CATALOGp. 270

To paste a string function or instruction on the current screen, open the CATALOG with 2ndCATALOG, jump or scroll to the item, and press ENTER, as in Selecting an Item from the CATALOG. The tutorials that follow each use exactly this method.

Equ►String(p. 270

Equ►String(
Equ►String(Yn,Strn)

Converts the equation stored in the Y-VARS function Yn into a string and stores that string in the string variable Strn (Str1 to Str9, or Str0). The equation must already be stored in a Y= variable.

Where: CATALOG only: 2ndCATALOG, jump to E, ▼︎ three times
Keys: 2ndCATALOGALPHAE▼︎▼︎▼︎ENTER
  • With X²+1 in Y₁, Equ►String(Y₁,Str1) stores the text X²+1 in Str1.

To paste the Y-variable, press VARS, move to the Y-VARS menu with ▶︎, choose 1:Function… and then 1:Y₁.

Tutorial

Convert Y₁ into a string

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Open the CATALOG and jump to the E items.
    2ndCATALOGALPHAE
  2. Scroll down three items to Equ►String(.
    ▼︎▼︎▼︎
  3. Paste it on the home screen.
    ENTER
  4. Paste Y₁ through VARS, Y-VARS (press ▶︎), Function, 1.
    VARS▶︎11
  5. Press , and paste the destination, Str1, from the STRING menu.
    ,VARS71
  6. Close the parenthesis and press ENTER.
    )ENTER

expr(p. 270

expr(
expr(string)

Treats the characters of string as an expression and evaluates it. string can be a quoted string or a string variable.

Where: CATALOG only: 2ndCATALOG, jump to E, ▼︎ four times
Keys: 2ndCATALOGALPHAE▼︎▼︎▼︎▼︎ENTER
  • expr("2+3") returns 5.
Tutorial

Evaluate a string with expr(

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Open the CATALOG, jump to E and scroll to expr(.
    2ndCATALOGALPHAE▼︎▼︎▼︎▼︎
  2. Paste it, then paste Str1 from the STRING menu.
    ENTERVARS71
  3. Close the parenthesis and press ENTER. The text 2+3 is evaluated.
    )ENTER

inString(p. 271

inString(
inString(string,substring[,start])

Returns the position in string where substring first begins. start is an optional position at which to begin the search; it defaults to 1. string can be a quoted string or a string variable.

Where: CATALOG only: 2ndCATALOG, jump to I, scroll down six items
Keys: 2ndCATALOGALPHAI▼︎▼︎▼︎▼︎▼︎▼︎ENTER
  • inString("HELLO","L") returns 3.
  • inString("HELLO","L",4) returns 4: the search starts at the fourth character.
Note If string does not contain substring, or if start is greater than the length of string, inString( returns 0.
Tutorial

Find a letter with inString(

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Open the CATALOG and jump to I.
    2ndCATALOGALPHAI
  2. Scroll down six items to inString(.
    ▼︎▼︎▼︎▼︎▼︎▼︎
  3. Paste it, then paste Str1.
    ENTERVARS71
  4. Press , and type the substring "L" in quotation marks.
    ,ALPHA"ALPHALALPHA"
  5. Close the parenthesis and press ENTER. The first L is the third character.
    )ENTER
Tutorial

Start the search later with a start position

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Paste inString( from the CATALOG and Str1.
    2ndCATALOGALPHAI▼︎▼︎▼︎▼︎▼︎▼︎ENTERVARS71
  2. Type the substring "L" and a start position of 4.
    ,ALPHA"ALPHALALPHA",4
  3. Close the parenthesis and press ENTER. The search skips the first L and finds the second.
    )ENTER
Tutorial

When the substring is not found

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Search for "Z" in Str1.
    2ndCATALOGALPHAI▼︎▼︎▼︎▼︎▼︎▼︎ENTERVARS71,ALPHA"ALPHAZALPHA")
  2. Press ENTER. There is no Z, so the result is 0.
    ENTER

length(p. 271

length(
length(string)

Returns the number of characters in string, which can be a quoted string or a string variable. A function or instruction name such as sin( counts as a single character.

Where: CATALOG only: 2ndCATALOG, jump to L, scroll down four items
Keys: 2ndCATALOGALPHAL▼︎▼︎▼︎▼︎ENTER
  • length("HELLO") returns 5.
  • A string containing the sin( token followed by 1 has length 2.
Tutorial

Count the characters in a string

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Open the CATALOG, jump to L and scroll to length(.
    2ndCATALOGALPHAL▼︎▼︎▼︎▼︎
  2. Paste it and then paste Str1.
    ENTERVARS71
  3. Close the parenthesis and press ENTER.
    )ENTER
Tutorial

A function name counts as one character

Here the string contains the single function token sin( followed by the digit 1: two characters, even though sin( looks longer.

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Paste length( from the CATALOG.
    2ndCATALOGALPHAL▼︎▼︎▼︎▼︎ENTER
  2. Type a quotation mark, press SIN for sin(, type 1 and the closing quote.
    ALPHA"SIN1ALPHA")
  3. Press ENTER. The result is 2.
    ENTER

String►Equ(p. 271

String►Equ(
String►Equ(string,Yn)

Converts string into an equation and stores it in the Y-VARS function Yn. string can be a quoted string or a string variable. It is the inverse of Equ►String(.

Where: CATALOG only: 2ndCATALOG, jump to T, press ▲︎ four times
Keys: 2ndCATALOGALPHAT▲︎▲︎▲︎▲︎ENTER
  • String►Equ("X²",Y₁) stores the equation X² in Y₁.
Tutorial

Turn a string into an equation

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Open the CATALOG and jump to T. String►Equ( is a few items above the T items, so press ▲︎ four times.
    2ndCATALOGALPHAT▲︎▲︎▲︎▲︎
  2. Paste it, then paste Str1 from the STRING menu.
    ENTERVARS71
  3. Press , and paste Y₁ through VARS, Y-VARS, Function, 1.
    ,VARS▶︎11
  4. Close the parenthesis and press ENTER. Y₁ now holds X².
    )ENTER

sub(p. 272

sub(
sub(string,begin,length)

Returns a piece of string as a new string. begin is the position of the first character to take, and length is how many characters to take. string can be a quoted string or a string variable.

Where: CATALOG only: 2ndCATALOG, jump to T, press ▲︎ three times
Keys: 2ndCATALOGALPHAT▲︎▲︎▲︎ENTER
  • sub("HELLO",2,3) returns ELL.
Tutorial

Take part of a string with sub(

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Open the CATALOG, jump to T and press ▲︎ three times to reach sub(.
    2ndCATALOGALPHAT▲︎▲︎▲︎
  2. Paste it, then paste Str1.
    ENTERVARS71
  3. Enter the start position 2 and the length 3.
    ,2,3)
  4. Press ENTER. Three characters starting at the second are returned.
    ENTER

Entering a Function to Graph during Program Executionp. 272

A program can ask the user to type a function, turn that text into an equation and graph it. The ingredients are Input (which stores what the user types as a string), String►Equ( (which stores the string in a Y= variable) and a graphing command.

:Input "ENTRY=",
Str1
:String►Equ(Str1
,Y₃)
:DispGraph
A short program sketch
Note When such a program runs, type your function, for example X², at the ENTRY= prompt. It is stored in Y₃. See Chapter 16 for how to write and run programs, and String►Equ( for the conversion step.

Hyperbolic Functions in the CATALOGp. 273

The hyperbolic functions are available only from the CATALOG. The table lists them in the order they appear there; each name is followed by what it computes.

CATALOG itemFunction
cosh(Hyperbolic cosine
cosh⁻¹(Hyperbolic arccosine
sinh(Hyperbolic sine
sinh⁻¹(Hyperbolic arcsine
tanh(Hyperbolic tangent
tanh⁻¹(Hyperbolic arctangent
Tip Where to find them in the CATALOG: cosh( is 21 items below the C jump (cosh⁻¹( is 22), sinh( is 19 below the S jump (sinh⁻¹( is 20), and tanh( is 3 below the T jump (tanh⁻¹( is 4). The inverse items show a raised ⁻¹ in the list.

sinh(, cosh(, tanh(p. 273

These are the hyperbolic sine, cosine and tangent. Each accepts a real number, an expression or a list. Given a list, it returns a list of results.

sinh(
sinh(value)

Hyperbolic sine of a real number, expression or list.

Where: CATALOG only: 2ndCATALOG, jump to S, scroll down 19 items
Keys: 2ndCATALOGALPHAS▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎ENTER
  • sinh(0) returns 0.
  • sinh(1) returns 1.175201194.
cosh(
cosh(value)

Hyperbolic cosine of a real number, expression or list.

Where: CATALOG only: 2ndCATALOG, jump to C, scroll down 21 items
Keys: 2ndCATALOGALPHAC▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎ENTER
  • cosh(0) returns 1.
  • cosh(1) returns 1.543080635.
tanh(
tanh(value)

Hyperbolic tangent of a real number, expression or list.

Where: CATALOG only: 2ndCATALOG, jump to T, scroll down 3 items
Keys: 2ndCATALOGALPHAT▼︎▼︎▼︎ENTER
  • tanh(1) returns 0.7615941559.
Tutorial

Compute a hyperbolic sine

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Open the CATALOG and jump to S.
    2ndCATALOGALPHAS
  2. Scroll down 19 items to sinh(.
    ▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎
  3. Paste it and enter 1.
    ENTER1)
  4. Press ENTER.
    ENTER
Tutorial

Compute a hyperbolic cosine

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Open the CATALOG and jump to C.
    2ndCATALOGALPHAC
  2. Scroll down 21 items to cosh(.
    ▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎
  3. Paste it and enter 1.
    ENTER1)
  4. Press ENTER.
    ENTER
Tutorial

Compute hyperbolic tangents of a list

The hyperbolic functions accept lists. Here tanh( is applied to the list {0, 1}.

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Open the CATALOG, jump to T and scroll to tanh(.
    2ndCATALOGALPHAT▼︎▼︎▼︎
  2. Paste it, then type the list {0,1}.
    ENTER2nd{0,12nd})
  3. Press ENTER. A list of two results appears: 0 and 0.7615941559.
    ENTER

sinh⁻¹(, cosh⁻¹(, tanh⁻¹(p. 273

sinh⁻¹( is the hyperbolic arcsine, cosh⁻¹( the hyperbolic arccosine and tanh⁻¹( the hyperbolic arctangent. Each accepts a real number, an expression or a list. They undo sinh(, cosh( and tanh(.

sinh⁻¹(
sinh⁻¹(value)

Hyperbolic arcsine of a real number, expression or list.

Where: CATALOG only: 2ndCATALOG, jump to S, scroll down 20 items
Keys: 2ndCATALOGALPHAS▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎ENTER
  • sinh⁻¹(1) returns 0.881373587.
cosh⁻¹(
cosh⁻¹(value)

Hyperbolic arccosine of a real number, expression or list. The value must be 1 or greater to get a real result.

Where: CATALOG only: 2ndCATALOG, jump to C, scroll down 22 items
Keys: 2ndCATALOGALPHAC▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎ENTER
  • cosh⁻¹(2) returns 1.316957897.
tanh⁻¹(
tanh⁻¹(value)

Hyperbolic arctangent of a real number, expression or list. The value must be between −1 and 1 to get a real result.

Where: CATALOG only: 2ndCATALOG, jump to T, scroll down 4 items
Keys: 2ndCATALOGALPHAT▼︎▼︎▼︎▼︎ENTER
  • tanh⁻¹(0.5) returns 0.5493061443.
Tutorial

Compute a hyperbolic arcsine

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Open the CATALOG, jump to S and scroll down 20 items to sinh⁻¹(.
    2ndCATALOGALPHAS▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎
  2. Paste it and enter 1.
    ENTER1)
  3. Press ENTER.
    ENTER
Tutorial

Compute a hyperbolic arccosine

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Open the CATALOG, jump to C and scroll down 22 items to cosh⁻¹(.
    2ndCATALOGALPHAC▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎▼︎
  2. Paste it and enter 2.
    ENTER2)
  3. Press ENTER.
    ENTER
Tutorial

Compute a hyperbolic arctangent

▶ Try this step-by-step on the online TI-84 Plus — keys light up as you go

  1. Open the CATALOG, jump to T and scroll down four items to tanh⁻¹(.
    2ndCATALOGALPHAT▼︎▼︎▼︎▼︎
  2. Paste it and enter 0.5.
    ENTER0.5)
  3. Press ENTER.
    ENTER
◀ Chapter 14: ApplicationsChapter 16: Programming ▶