Texas Instruments TI-89 사용자 설명서

Previews

110

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

Display

1. Display the

MODE

dialog box. For

Graph

mode, select

FUNCTION

. For

Angle

mode,

select

RADIAN

Press

3 B 1 D D D B 1 ¸

2. Display the Home screen. Use the

Graph

command and the

when

function to

specify the piecewise defined function.
†

selects

Graph

from the

Other

toolbar

menu and automatically adds a space.

Press "

† 2 2 ™ WHEN j

c X 2 Â 0 b ? X b 5 p 2 X X

d d

3. Execute the

Graph

command, which

automatically displays the Graph screen.

The graph uses the current Window
variables, which are assumed to be their
standard values (

„

) for this example.

Press

Graph when(x<0,

…

cos(x))