Question about Texas Instruments TI-89 Calculator
First you must configure your calculator to perform 3D graphics
1.The first line shown is Graph. Unfold the hidden menu list with the right arrow and choose Graph 5:3D
2. Press ENTER to validate.
Now you must define the surface you want to draw
1. Press the [diamond] key then [Y=] to get a list of function names, the first of which is z1
2. Enter the following function (or your own) z1=(x^3*y-y^3*x)/390
( x cubed times y -y cubed times x) divided by 390.
3 Press ENTER.
Graph the function
Press the [diamond] key then [GRAPH]
The graphing screen displays progress in %. When it is finished you will see a weird sombrero.
Hope it helps
Posted on Mar 21, 2011
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Posted on Jan 02, 2017
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