Texas Instruments TITANIUM TI-89 - Manual (Page 305)

Basic Function Graphing 305
Angle Mode Angle Mode Angle Mode Angle Mode
When using trigonometric functions, set the Angle mode for the units (RADIAN,
DEGREE or GRADIAN) in which you want to enter and display angle values.
Checking the Status Line Checking the Status Line Checking the Status Line Checking the Status Line
To see the current Graph mode and Angle mode, check the status line at the bottom of
the screen.
Defining Functions for Graphing Defining Functions for Graphing Defining Functions for Graphing Defining Functions for Graphing
In FUNCTION graphing mode, you can graph functions named y1(x) through y99(x) . To
define and edit these functions, use the Y= Editor. (The Y= Editor lists function names for
POLAR r( q ) polar equations
SEQUENCE u(n) sequences
3D z(x,y) 3D equations
DIFFERENTIAL EQUATION y'(t) differential equations
Graph Mode Setting Description
Angle
Mode Graph
Mode