HP 33s - Manual (Page 98)

6–6 Entering and Evaluating Equations
Parentheses in Equations
You can include parentheses in equations to control the order in which operations
are performed. Press
| ] and | ` to insert parentheses. (For more
information, see "Operator Precedence" later in this chapter.)
Example: Entering an Equation.
Enter the equation r = 2 × c × cos (t – a)+25
Keys: Display: Description:
| H
#/
)º
πº:º Shows the last equation used in
the equation list.
L R | d
/¾ Starts a new equation with
variable R.
2 / _ Enters a number, changing the
cursor to "_".
z L C z
/ºº¾ Enters infix operators.
R
/ºº 1¾ Enters a prefix function with a
left parenthesis.
L T L A
| ` › 25

º 1!.2-_ Enters the argument and right
parenthesis.
‘
/ºº 1!.2 Terminates the equation and
displays it.
| 
/

/
 Shows its checksum and length.
‡
 Leaves Equation mode.
Displaying and Selecting Equations
The equation list contains the equations you've entered. You can display the
equations and select one to work with.
To display equations:
1. Press | H . This activates Equation mode and turns on the EQN
annunciator. The display shows an entry from the equation list: