Texas Instruments TITANIUM TI-89 - Manual (Page 346)

Polar Graphing 346
During a trace, you can also evaluate r( q ) by typing the q value and pressing ¸.
Note: You can use QuickCenter at any time during a trace, even if the cursor is still on
the screen.
…
Trace Lets you move the cursor along a graph one q step at a
time.
• When you begin a trace, the cursor is on the first selected
equation at
q min .
• QuickCenter applies to all directions. If you move the
cursor off the screen (top or bottom, left or right), press
¸
to center the viewing window on the cursor
location.
• Automatic panning is not available. If you move the cursor
off the left or right side of the screen, the TI-89 Titanium /
Voyage™ 200 Graphing Calculator will not automatically
pan the viewing window. However, you can use
QuickCenter.
‡
Math Only 1:Value, 6:Derivatives, 9:Distance, A:Tangent, and
B:Arc are available for polar graphs. These tools are
based on
q values. For example:
• 1:Value displays an r value (or x and y, depending on the
graph format) for a specified q value.
• 6:Derivatives finds dy/dx or dr/d q at a point defined for
a specified q value.
Tool For Polar Graphs: