Chapter 9: Split Screen; Getting Started: Exploring The Unit Circle - Texas Instruments TI-84 PLUS - Graphing Calculator Manual Book

Chapter 9:
Split Screen

Getting Started: Exploring the Unit Circle

Getting Started is a fast-paced introduction. Read the chapter for details.
Use (graph-table) split-screen mode to explore the unit circle and its relationship to the
G-T
numeric values for the commonly used trigonometric angles of 0¡ 30¡, 45¡, 60¡, 90¡, and so on.
1. Press z to display the mode screen. Press †
† ~ Í to select
Í to select
Par
Press † † † † ~ ~ Í to select
table) split-screen mode.
2. Press † † † † ~ Í to display the format
screen. Press † † † † † ~ Í to select
.
ExprOff
3. Press o to display the Y= editor for
mode. Press ™ „ ¤ Í to store
. Press ÷ ˜ „ ¤ Í to store
to
X1T
to .
Y1T
4. Press p to display the window editor. Enter
these values for the window variables.
Tmin=0 Xmin=
Tmax=360 Xmax=2.3
Tstep=15 Xscl=1
5. Press r. On the left, the unit circle is graphed
parametrically in
Degree
cursor is activated. When
trace coordinates), you can see from the table on
the right that the value of
) is 0. Press ~ to move the cursor to the
(
sin(T)
next 15¡ angle increment. As you trace around the
circle in steps of 15¡, an approximation of the
standard value for each angle is highlighted in the
table.
6. Press y - and change
mode. Press † ~
Degree
(parametric) graphing mode.
G-T
Par
L 2.3 Ymin= L 2.5
Ymax=2.5
Yscl=1
mode and the trace
(from the graph
T=0
( ) is
X1T cos(T)
to
Indpnt Ask
(graph-
graphing
cos(T)
sin(T)
and
1 Y1T
.

Chapter 9: Split Screen

137