In order to see the effects of a ZOOM option,
a graph must already be displayed on the screen. To learn how to
enter and graph a function, go to Graphing
a Function . For example, the function 
= 
is graphed
below.
The ZOOM 7:ZTrig option allows the user to select
a new VIEWING RECTANGLE that has an appropriate dimension for
viewing trigonometric functions such as 
.
The VIEWING RECTANGLE that is set by this option is [-(27/24)
, (27/24),/2] X [-4,4,1], where the values are set
in radian mode. Enter
for
and graph the trigonometric equation in a standard VIEWING RECTANGLE
of [-10,10,1] X [-10,10,1]. Do this by pressing Zoom and then 6.
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To select the ZOOM 7:ZTrig option, first press the ZOOM key and then select 7. Notice that using Zoom 7 produces a much better graph as shown below.
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