Sharp EL-9900 EL9900 Operation Manual - Page 96

Graphing Polar Equations

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GRAPHING POLAR EQUATIONS Steps for graphing a polar function: 1. Turn the calculator on and press 2ndF SET UP E (COORD) 3 (Polar) to change to polar mode. While in the SET UP menu, the calculator should be setup in radian mode. To complete this setup, press B (DRG) 2 (Rad). Press 2ndF QUIT to exit the SET UP menu. 2. Make sure calculator is in connected mode by pressing 2ndF DRAW D (LINE) ENTER . The first option should be reflected for R1. Set the calculator to display polar coordinates when tracing, by pressing 2ndF FORMAT F (CURSOR) and 2 (PolarCoord). Also, set the calculator to display the expression during tracing by pressing B (EXPRESS) 1 (ON). Press 2ndF QUIT to exit the FORMAT menu. 3. Press Y= to access the R1 prompt. Press CL to remove an old R1 expression. Press ENTER CL to clear additional R prompts. 4. Enter the polar function r = 2(1 - cos θ) for R1, by pressing 2 ( 1 - cos X/θ/T/n ) . Notice, when in polar mode the X/θ/T/n key provides a θ for equation entry. 5. Now, graph the polar function in the Decimal viewing window by pressing ZOOM A (ZOOM) 7 (Dec). 6. This particular shape of curve is called a cardoid. Trace the curve by pressing TRACE . Notice the expression is displayed at the top of the screen. 21 Advanced Keyboard/CALCULUS USING THE SHARP EL-9900 Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.

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21
Advanced Keyboard/CALCULUS USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation.
Permission is granted to photocopy for educational use only.
Steps for graphing a polar function:
1.
Turn the calculator on and press
2ndF
SET UP
E
(COORD)
3
(Polar)
to change to polar mode.
While in the SET UP menu, the
calculator should be setup in radian mode.
To complete this setup, press
B
(DRG)
2
(Rad)
. Press 2ndF
QUIT
to exit the SET UP menu.
2.
Make sure calculator is in connected mode by pressing
2ndF
DRAW
D
(LINE)
ENTER .
The first option should be reflected for R1.
Set the
calculator to display polar coordinates when tracing, by pressing
2ndF
FORMAT
F
(CURSOR)
and
2
(PolarCoord)
.
Also, set the calculator to
display the expression during tracing by pressing
B
(EXPRESS)
1
(ON)
.
Press 2ndF
QUIT
to exit the FORMAT menu.
3.
Press
Y=
to access the R1 prompt.
Press CL
to remove an old R1
expression.
Press
ENTER
CL
to clear additional R prompts.
4.
Enter the polar function
r
= 2(1 – cos
θ
) for R1, by pressing
2
(
1
–
cos
X/
θ
/T/
n
)
.
Notice, when in polar mode the
X/
θ
/T/
n
key
provides a
θ
for equation entry.
5.
Now, graph the polar function in the Decimal viewing window by pressing
ZOOM
A
(ZOOM)
7
(Dec)
.
6.
This particular shape of curve is called a cardoid.
Trace the curve by
pressing
TRACE
.
Notice the expression is displayed at the top of the
screen.
GRAPHING POLAR EQUATIONS