HP 33S - Parentheses in Equations; Displaying and Selecting Equations

6–6 Entering and Evaluating Equations
File name 33s-E-Manual-1008-Publication(1st).doc Page : 386
Printed Date : 2003/10/8 Size : 13.7 x 21.2 cm
Parentheses in Equations
You can include parentheses in equations to control the order in which operations
are performed. Press
º y
and
º |
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:
º d

π

Shows the last equation used in
the equation list.
h
R
º ¢

Starts a new equation with
variable R.
2
 
_

Enters a number, changing the
cursor to "_".
¸ h
C
¸

Enters infix operators.
n

Enters a prefix function with a
left parenthesis.
h
T
à h
A
º | Ù
25


_

Enters the argument and right
parenthesis.
Ï

Terminates the equation and
displays it.
º Î


Shows its checksum and length.
Å

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
º d
. This activates Equation mode and turns on the EQN
annunciator. The display shows an entry from the equation list: