HP 40g hp 39g & 40g_user's manual_English_E_pdfbpia5212.pdf - Page 60
Example: plotting a circle
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Example: plotting a circle Plot the circle, x2+ y2 = 9. First rearrange it to read y = ± 9 - x2 . To plot both the positive and negative y values, you need to define two equations as follows: y = 9 - x2 and y = - 9 - x2 1. In the Function aplet, specify the functions. Select Function √9 √9 2. Reset the graph setup to the default settings. SETUP-PLOT CLEAR 3. Plot the two functions and hide the menu so that you can see all the circle. 4. Reset the numeric setup to the default settings. SETUP-NUM CLEAR 5. Display the functions in numeric form. 2-20 Aplets and their views
2-20
Aplets and their views
Example: plotting a circle
Plot the circle,
x
2
+ y
2
=
9
.
First rearrange it to read
.
To plot both the positive and negative
y
values, you need to
define two equations as follows:
and
1.
In the Function aplet, specify the functions.
>$3/(7@
Select
Function
>6+,)7@
√
¶>³@¶
9
>²@>;µ7µ
5
@>;
²
@>´@>(17(5@
>³²´@¶>6+,)7@¶
√
¶>³@¶
9
>²@>;µ7µ
5
@¶
>;
²
@>´@>(17(5@
2.
Reset the graph setup to the default settings.
>6+,)7@
SETUP
-
PLOT
>6+,)7@
CLEAR
3.
Plot the two functions
and hide the menu so that
you can see all the circle.
>3/27@
4.
Reset the numeric setup to the default settings.
>6+,)7@
SETUP
-
NUM
>6+,)7@
CLEAR
5.
Display the functions in numeric form.
>180@
y
9
x
2
–
±
=
y
9
x
2
–
=
y
9
x
2
–
–
=