9–2 Split Screen
8253D2~1.DOC TI-83 international English Bob Fedorisko Revised: 10/28/05 9:26 AM Printed: 10/28/05 9:26
M Page 2 of 6
Getting Started is a fast-paced introduction. Read the chapter for details.
Use
G.T (graph-table) split-screen mode to explore the unit circle and its relationship
to the 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
Degree mode. Press
† ~ Í to select
Par (parametric)
graphing mode.
Press † † † † ~ ~ Í to select
G.T
(graph-table) split-screen mode.
2. Press y [FORMAT] to display the format
screen. Press † † † † † ~ Í to
select
ExprOff.
3. Press o to display the Y= editor for Par
graphing mode. Press ™ „ ¤ Í
to store
cos(T) to X1T. Press ˜ „ ¤
Í to store
sin(T) to Y1T.
4. Press p to display the window editor.
Enter these values for the window variables.
Tmin=0 Xmin=L2.3 Ymin=L2.5
Tmax=360 Xmax=2.3 Ymax=2.5
Tstep=15 Xscl=1 Yscl=1
5. Press r. On the left, the unit circle is
graphed parametrically in
Degree mode and
the trace cursor is activated. When
T=0 (from
the graph trace coordinates), you can see from
the table on the right that the value of
X1T
(cos(T)) is 1 and Y1T (sin(T)) is 0. Press ~ to
move the cursor to the 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.
Getting Started: Exploring the Unit Circle
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