Texas Instruments TI-89 Titanium User Manual page 377

Effect of Changing
The view on the Graph screen is always oriented along the viewing angle. From this
point of view, you can change
3 3
z1(x,y) = (x y – y
This example increments
Note:
3D Graphing
eyeq theta
q to rotate the viewing angle around the z axis.
eye
x) / 390
eye
eye
eye
q by 30.
eye
In this example eye
70
q = 20
q = 50
= 80
q
=
f
374