Texas Instruments TI89TITANIUM User Manual - Page 350
Technical Reference, Tables, Selecting Parametric Equations
UPC - 033317191833
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Be careful when using implied multiplication with t. For example: Enter: tùcos(60) Instead of: tcos(60) Because: tcos is interpreted as a user-defined function called tcos, not as implied multiplication. In most cases, this refers to a nonexistent function. So the TI-89 Titanium simply returns the function name, not a number. Note: When using t, be sure implied multiplication is valid for your situation. You can use the Define command from the Home screen (see the Technical Reference module) to define functions and equations for any graphing mode, regardless of the current mode. The Y= Editor maintains an independent function list for each Graph mode setting. For example, suppose: • In FUNCTION graphing mode, you define a set of y(x) functions. You change to PARAMETRIC graphing mode and define a set of x and y components. • When you return to FUNCTION graphing mode, your y(x) functions are still defined in the Y= Editor. When you return to PARAMETRIC graphing mode, your x and y components are still defined. Selecting Parametric Equations To graph a parametric equation, select either its x or y component or both. When you enter or edit a component, it is selected automatically. Selecting x and y components separately can be useful for tables as described in Tables. With multiple parametric equations, you can select and compare all the x components or all the y components. Parametric Graphing 350