Texas Instruments Titanium TI-89 User Manual

Previews 90
2. Display the Home screen. Then store the
radius, 5, in variable r.
Press " 5 9 j R ¸
3. Display and clear the
Y= Editor. Then
define y1(x) = , the top half of
a circle.
In function graphing, you must define
separate functions for the top and bottom
halves of a circle.
Press 8 # , 8 ¸ ¸ 2 ]
j R Z 2 | X Z 2 d ¸
4. Define y2(x) = , the function for
the bottom half of the circle.
The bottom half is the negative of the top
half, so you can define y2(x) = Ly1(x).
Use the full function name
y1(x), not
simply y1.
Press ¸ ? Y 1 c X d ¸
Steps and keystrokes Display
5!r
r
2
x
2
–()
r
2
x
2
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Texas Instruments Titanium TI-89 Specifications

General

Display Type	LCD
Display Resolution	160 x 100 pixels
Memory	188 KB RAM, 2.7 MB Flash ROM
Type	Graphing Calculator
Display	Monochrome
Processor	Motorola 68000
Processor Speed	12 MHz
Power Source	4 AAA batteries
Connectivity	USB
Programming	TI-BASIC, Assembly
Operating System	AMS (Advanced Mathematics Software)