HP 39gII User Manual page 160

The button labelled is a
toggle between and
. When is
chosen, and
= \ <
, ,
>
control vertical and
horizontal translations. For horizontal translations, the F6
menu key controls the magnitude of the increment. By
default, the increment is set at . When is
π 9 ⁄
= \ < >
chosen , , and control vertical and
horizontal dilations with respect to their respective axes.
Thus, the arrow keys effectively change the amplitude
and frequency of the graph. This is most easily seen by
experimenting.
Press the F1 menu key to
toggle from GRAPH to EQ. In
this mode, the graph is
controlled by the equation. In
the equation displayed at the
top of the screen, one of the parameters is highlighted.
= \
Press or to increase or decrease the value of the
highlighted parameter. Press > and < to move from
parameter to parameter.
The default angle setting for this app is radians. The angle
setting can be changed to degrees by pressing .
Like the Quadratic Explorer app, the Trig Explorer app
also has a TEST view.
150 The Explorer Apps