Texas Instruments TI89TITANIUM User Manual - Page 349
Differences in Parametric and Function Graphing, Setting the Graph Mode
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• Use the „ Zoom toolbar menu to zoom in or out on a portion of the graph. • Use the ‡ Math toolbar menu to find derivatives, tangents, etc. Some menu items are not available for parametric graphs. Differences in Parametric and Function Graphing This module assumes that you already know how to graph y(x) functions as described in Basic Function Graphing. This section describes the differences that apply to parametric equations. Setting the Graph Mode Use 3 to set Graph = PARAMETRIC before you define equations or set Window variables. The Y= Editor and the Window Editor let you enter information for the current Graph mode setting only. Defining Parametric Equations on the Y= Editor To graph a parametric equation, you must define both its x and y components. If you define only one component, the equation cannot be graphed. (However, you can use single components to generate an automatic table as described in Tables.) Enter x and y components on separate lines. You can define xt1(t) through xt99(t) and yt1(t) through yt99(t). Parametric Graphing 349