HP 33s Scientific manual Displaying and Selecting Equations, Parentheses in Equations, LR d, ZLC z

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	#/)ºπº:º
LR d	/¾
2	/ _
zLC z	/ºº¾

R/ºº 1¾

LT …LA 

`›25 º 1!.2-_

‘/ºº 1!.2

 / / 

‡

Shows the last equation used in the equation list.

Starts a new equation with variable R.

Enters a number, changing the cursor to "_".

Enters infix operators.

Enters a prefix function with a left parenthesis.

Enters the argument and right parenthesis.

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:

6–6Entering and Evaluating Equations