Texas Instruments TITANIUM TI-89 - Manual (Page 91)

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Note: There is a gap between the top and bottom halves of the circle because each half
is a separate function. The mathematical endpoints of each half are (L5,0) and (5,0).
Depending on the viewing window, however, the plotted endpoints for each half may be
slightly different from their mathematical endpoints.
5. Select the ZoomStd viewing window,
which automatically graphs the
functions.
In the standard viewing window, both the
x and y axes range from L10 to 10.
However, this range is spread over a
longer distance along the x axis than the
y axis. Therefore, the circle appears as
an ellipse.
Press „ 6
6. Select ZoomSqr .
ZoomSqr increases the range along the
x axis so that circles and squares are
shown in correct proportion.
Press „ 5
Steps and keystrokes Display
Notice slight gap
between top and
bottom halves.