Texas Instruments Titanium TI-89 User Manual

Operating the Calculator 168
APPROXIMATE — All numeric results, where possible, are displayed in floating-point
(decimal) form.
Note: Results are rounded to the precision of your graphing calculator and displayed
according to current mode settings.
Because undefined variables cannot be evaluated, they are treated algebraically.
For example, if the variable r is undefined, pr
2
= 3.14159⋅r
2
.
AUTO — Uses the EXACT form where possible, but uses the APPROXIMATE form when
your entry contains a decimal point. Also, certain functions may display APPROXIMATE
results even if your entry does not contain a decimal point.
Fractional results are evaluated
numerically.
S
ym
b
o
li
c
f
orms, w
h
ere poss
ibl
e, are
evaluated numerically
A decimal in the entry forces a
floating-point result.

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)