Texas Instruments PLUS TI-89 - Manual (Page 190)

Chapter 10: 3D Graphing 173
10_3D.DOC TI-89/TI-92 Plus: 3D Graphing (English) Susan Gullord Revised: 02/23/01 11:00 AM Printed: 02/23/01 4:22 PM Page 173 of 22
Graph the equation sin(x 4 +y ì x 3 y) = .1 .
1. Use 3 to set Graph = 3D .
2. Press ¥ #, and define the
equation:
z1(x,y)=sin(x^4+y ì x^3y) ì .1
3. Press ¥ $, and set
the Window variables as
shown.
4. Press:
TI - 89: ¥ Í
TI - 92 Plus : ¥ F
T urn on the axes, set
Style = IMPLICIT PLOT , and
return to the Window
editor.
5. Press ¥ % to graph
the equation.
It will take awhile to
evaluate the graph; so be
patient.
6. Use the cursor keys to
animate the graph and view
it from different
eye angles.
Example: Implicit Plot of a More Complicated Equation
You can use the IMPLICIT PLOT graph format style to plot and
animate a complicated equation that cannot be graphed
otherwise. Although it may take a long time to evaluate such a
graph, the visual results can justify the time required.
Example
Note: For more detail,
increase the xgrid and ygrid
Window variables. However,
this increases the graph
evaluation time.
Tip: When you animate the
graph, the screen changes
to normal view. Press
p to
switch between normal and
expanded views.
The graph shows where
sin(x 4 +y ì x 3 y) = .1
In expanded view, this example
shows eye q = ë 127.85, eye f =52.86,
and eye ψ = л 18.26.