to view the zoom menu.
to view more options.
.
to select ZBox
which defines a viewing window by selecting the corners of the box.
Press 
to select Zoom
In which displays a smaller viewing area of the graph; magnifying the
current graph.
Press 
to select Zoom
Out which displays a larger viewing area of the graph; reducing the
current graph.
Press 
to select ZDecimal which sets Xmin = -4.7, Xmax = 4.7, Ymin = -3.1, and
Ymax = 3.1. Each pixel represents 0.1 units. The tic marks on each axis
are equally spaced.
Press 
to select ZSquare which adjusts Xmin and Xmax so that the tic marks on
the x axis are spaced the same as those on the y axis. This makes a circle
appear round.
Press 
to select ZStandard
which which sets Xmin = -10, Xmax = 10, Ymin = -10, and Ymax = 10.
Press 
to select ZTrig which sets Xmin = -6.152285 about 2
,
Xmax = 6.152285 about 2,
Xscl = 1.5707963 about /2,
Ymin = -4, Ymax = 4 and Yscl = 1 in radian mode and Xmin = -352.5, Xmax
= 352.5, Xscl = 90, Ymin = -4, Ymax = 4, and Yscl = 1 in degree mode.
Press 
to select ZInteger which sets Xscl = 10 and Yscl = 10, and centers the
graph at the cursor location.
Press 
to select ZoomStat
which defines the viewing window so that all data points are shown.
Press 
to select ZoomFit which adjusts Ymin and Ymax include the minimum and maximum
y values for the selected functions.
