Texas Instruments TI-89 User Manual - Page 353
tstep, ZoomStd, tmin = 0, tmax = 2, Trace, Value, Derivatives, Distance, A:Tangent, B:Arc, dy/dx
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Tool „ Zoom ... Trace ‡ Math For Parametric Graphs: Works just as it does for function graphs, with the following exceptions: • Only x (xmin, xmax, xscl) and y (ymin, ymax, yscl) Window variables are affected. • The t Window variables (tmin, tmax, tstep) are not affected unless you select 6:ZoomStd (which sets tmin = 0, tmax = 2p, and tstep = p/24). Lets you move the cursor along a graph one tstep at a time. • When you begin a trace, the cursor is on the first selected parametric equation at tmin. • 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 will not automatically pan the viewing window. However, you can use QuickCenter. Only 1:Value, 6:Derivatives, 9:Distance, A:Tangent, and B:Arc are available for parametric graphs. These tools are based on t values. For example: • 1:Value displays x and y values for a specified t value. • 6:Derivatives finds dy/dx, dy/dt, or dx/dt at a point defined for a specified t value. Parametric Graphing 353