! "
In the GRAPH Mode, follow these steps to graph a unit circle:
a. [SHIFT] [MENU] (SET UP) and set the eighth line to Deg.
b. On the Y= screen, press [F3] (TYPE) [F3] (Parm).
c. Enter the equations Xt1 = cos T and Yt1 = sin T.
d. Set the View Window to
Xmin = -3.15
Xmax = 3.15
Xscale = 1
Ymin = -1.55
Ymax = 1.55
Yscale = 1
Tmin =
0
Tmax = 900
Tpitch = 15
e. Display the graph.
Now you can press [SHIFT] [F1] to find the coordinates of points on the circle.
!
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In Radian mode, the calculator treats the input of a sine, cosine, or tangent function as a
radian measure instead of a degree measure. It also returns a radian measure when you
use the inverse functions. In the RUN Menu, to put the calculator in Radian mode, press
[SHIFT] [MENU] (SET UP) and set the fifth line to Rad.
Overriding Radian or Degree Mode
In Radian mode, enter a degree symbol, °, after the input if you want the calculator to
override the Radian mode and treat the input as a degree measure. To find the degree
symbol, as well as other angle options we will use, press [OPTN] [F6] [F5] (ANGL).
Until you press [EXIT], these angle options will remain on the screen.
56 Discovering Advanced Algebra Calculator Notes for the Casio 9750G PLUS/9850GB PLUS
2004 Key Curriculum Press
CHAPTER 10
r
In Degree mode, enter a radian symbol, , after the input if you want the calculator to
override the Degree mode and treat the input as a radian measure.
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You can use the override feature to convert an angle measure from radians to degrees or
from degrees to radians.
For example, follow these steps to convert 30° to radians:
a. Set the calculator to Radian mode.
b. In the RUN Mode, enter 30°. 30° is equivalent to .5235987756 radians.
For another example, follow these steps to convert 7π/12 radians to degrees:
a. Set the calculator to Degree mode.
r
r
b. In the RUN Mode, enter (7π/12) . So (7π/12) is equivalent to 105°.
!
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The calculator does not have built-in secant, cosecant, or cotangent functions. You must
calculate these functions by using the appropriate reciprocal identities.
For example, in Radian mode,
To evaluate sec (π/6):
To evaluate csc (π/6):
To evaluate cot (π/6):
Discovering Advanced Algebra Calculator Notes for the Casio 9750G PLUS/9850GB PLUS
2004 Key Curriculum Press
CHAPTER 10
57
To find the inverse of a secant, cosecant, or cotangent function, use the reciprocal
identity’s inverse with the reciprocal of the input.
–1
–1
–1
For example, in radian mode, to find sec (3), csc (3), cot (3),
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+
" ,(
With a link cable, connect the EA-100 to the calculator. Be sure to push in each plug
firmly. Choose the PRGM icon from the Main Menu. Highlight the program SOUND.
Press [F1] (EXE). If the SOUND program is not listed, you will need to load the program
provided at http://www.keymath.com/DAA/calculator_programs.html.
Ring a tuning fork press [TRIGGER] on the EA-100. The program only collects data for
.02 seconds and displays the graphs. Press [EXE] to view the repeat options. If the graph
does not look like a sinusoidal curve, repeat data collection. When you have good data,
time data will be stored in List 1, and frequency data will be stored in List 2.
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Graphing Polar Equations
Follow these steps to graph a polar equation:
a. In the GRAPH Mode, press [SHIFT] [MENU] (SET UP) and set the eighth line to
Deg. Press [EXIT].
b. While the Graph Function Menu is on the display, press [F3] (TYPE) [F2] (r =) to
specify a polar coordinate expression.
c. Enter the expression using [x,θ, T] for the variable θ.
d. Press [SHIFT] [F3] (V-Window) and set an appropriate window. One is shown
below.
e. Press [EXIT] and then draw the graph.
58 Discovering Advanced Algebra Calculator Notes for the Casio 9750G PLUS/9850GB PLUS
2004 Key Curriculum Press
CHAPTER 10
Tracing Polar Coordinates
You can find the coordinates of points on a polar graph by pressing [SHIFT] [F1] while
the graph is displayed. The coordinates displayed for a polar coordinate graph are (r,θ).
Use the [ ] and [ ] keys to trace the graph.
Discovering Advanced Algebra Calculator Notes for the Casio 9750G PLUS/9850GB PLUS
2004 Key Curriculum Press
CHAPTER 10
59