Texas Instruments TI-83 PLUS - Manual (Page 250)

TI-83 Plus Split Screen 247
3. Press o to display the Y= editor for Par
graphing mode. Press ™ „ ¤ Í to
store cos(T) to X 1T
. Press ˜ „ ¤ Í
to store sin(T) to Y 1T
.
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
X 1T
( cos(T) ) is
1 and Y 1T
( 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.