Texas Instruments -84 Plus, Manual Book

Page: 215 / 696

Chapter 9: Split Screen 212
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=
L
2.3 Ymin=
L
2.5
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.
6. Press
y -
and change
Indpnt
to
Ask
.
7. Press
y 0
to make the table portion of the
split screen active. Press
†
or
}
to highlight a
value you want to edit, and then enter a new value
directly in the table to overwrite the previous value.