Operation Manual

Chapter 17: Activities 313
Graphing the Unit Circle and Trigonometric Curves
Problem
Using parametric graphing mode, graph the unit circle and the sine curve to show the relationship
between them.
Any function that can be plotted in
Func mode can be plotted in Par mode by defining the X
component as
T and the Y component as F(T).
Procedure
1. Press z. Select Parametric, Simul, and the default settings.
2. Press p. Set the viewing window.
3. Press o. Turn off all functions and stat plots. Enter the expressions to define the unit circle
centered on (0,0).
:DispGraph
:Pause
Display graph.
:FnOn 2
:Lbl Z
:Prompt C,D
Prompt for guess.
:DispGraph
:Pause
Display graph.
:If C=A
:Text(1,1,"C IS OK")
:If C
ƒA
:Text(1,1,"C IS
WRONG")
:If D=B
:Text(1,150,"D IS
OK")
:If D
ƒB
:Text(1,150,"D IS
WRONG")
Display results.
:DispGraph
:Pause
Display graph.
:If C=A and D=B
:Stop
:Goto Z
Quit if guesses are correct.
Tmin=0
Tmax=2
p
Tst e p=. 0 5
Xmin=
L2
Xmax=7.4
Xscl=
pà2
Ymin=
L3
Ymax=3
Yscl=1