Texas Instruments TI-89 Titanium User Manual page 101

Additional Graphing Topics
From the Home screen, graph the piecewise defined function: y = Lx when x < 0 and
y = 5 cos(x) when x ‚ 0. Draw a horizontal line across the top of the cosine curve. Then
save a picture of the displayed graph.
Steps and keystrokes
1. Display the
MODE
mode, select
FUNCTION
select
RADIAN
Press 3 B 1 D D D B 1 ¸
2. Display the Home screen. Use the
command and the
specify the piecewise defined function.
†
selects
2 Graph
menu and automatically adds a space.
@ " † 2 2 ™ WHEN j
c X 2 Â 0 b ? X b 5 p 2
X X d d
3. Execute the
Graph
automatically displays the Graph screen.
The graph uses the current Window
variables, which are assumed to be their
standard values („
Press ¸
Previews
dialog box. For
. For
Angle
.
function to
when
from the
Other
command, which
) for this example.
6
Display
Graph
mode,
Graph
Graph when(x<0,
5 ... cos(x))
toolbar
x,
L
98