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Getting Started: Exploring The Unit Circle; 9-2 Split Screen - Texas Instruments TI-82 STATS Manual Book

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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
G.T
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
† ~ Í to select
graphing mode.
Press † † † † ~ ~ Í to select
(graph-table) split-screen mode.
2. Press y [
FORMAT
screen. Press † † † † † ~ Í to
select
.
ExprOff
3. Press o to display the
graphing mode. Press ™ „ ¤ Í
to store
to
cos(T)
Í to store
sin(T)
4. Press p to display the window editor.
Enter these values for the window variables.
Tmin=0
Xmin=L2.3
Tmax=360
Xmax=2.3
Tstep=15
Xscl=1
5. Press r. On the left, the unit circle is
graphed parametrically in
the trace cursor is activated. When
the graph trace coordinates), you can see from
the table on the right that the value of
(
) is
and
cos(T)
1
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.
9–2 Split Screen
mode. Press
Degree
(parametric)
Par
] to display the format
editor for
Y=
. Press ˜ „ ¤
X
1T
to
.
Y
1T
Ymin=L2.5
Ymax=2.5
Yscl=1
mode and
Degree
T=0
. Press ~ to
(
) is
Y
sin(T)
0
1T
G.T
Par
(from
X
1T

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