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 4:ZDecimal option allows the user to select a new VIEWING RECTANGLE, namely [-4.7,4.7,1] X [-3.1,3.1,1]. This sets the increments for both X and Y equal to 0.1 and sets the X and Y value of each pixel to one decimal place.
To select the ZOOM 4:ZDecimal option, first press the ZOOM key and then select 4.
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