Texas Instruments TI-89, TI-92

202 Chapter 12: Additional Graphing Topics

12ADDLGR.DOC TI-89/TI-92 Plus: Additional Graphing Tools (English) Susan Gullord Revised: 02/23/01 1:03 PM Printed: 02/23/01 2:15 PM Page 202 of 20

Steps

TI-89

Keystrokes

›

TI-92 Plus

Keystrokes Display

1. Display the

MODE dialog box.

For Graph mode, select

FUNCTION.

For Angle mode, select RADIAN.

DDD

2. Display the Home screen. Use

the Graph command and the

when function to specify the

piecewise defined function.

† 2

selects

Graph

from the

Other

toolbar menu and automatically adds

a space.

†22™

WHENjcX

2Â0b·X

b5p2X

Xdd

¥"

†2

WHENcX

2Â0b·X

b5pX

Xdd

Graph when(x<0,ëx,5ùcos(x))

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

(„ 6)

for this

example.

¸¸

4. Draw a horizontal line across

the top of the cosine curve.

The calculator remains in “line” mode

until you select a different operation

or press

2‰5

C(until the line

is positioned)

‰5

C(until the line

is positioned)

5. Save a picture of the graph. Use

PIC1 as the variable name for the

picture.

Be sure to set Type = Picture. By

default, it is set to GDB.

ƒ2

B2DD

PICj1

¸¸

ƒ2

B2DD

PIC 1

¸¸

6. Clear the drawn horizontal line.

You can also press

†

to regraph.

2ˆ1ˆ1

7. Open the saved picture variable

to redisplay the graph with the

line.

Be sure to set Type = Picture. By

default, it is set to GDB.

ƒ1

(if not already

shown, also set

Variable = pic1)

ƒ1

(if not already

shown, also set

Variable = pic1)

Preview of Additional Graphing Topics

From the Home screen, graph the piecewise defined function: y = ìx 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.