HP 39G User Manual

1-14 Getting started
Trig Explorer
aplet
The Trig Explorer aplet is used to investigate the behaviour
of the graph of as the values of a, b, c
and d change, both by manipulating the equation and seeing
the change in the graph, or by manipulating the graph and
seeing the change in the equation.
When the user presses
67$57a
in the
$3/(7a view, the screen
shown right is displayed.
In this mode, the graph
controls the equation. Pressing
the *k,*e, and *>,*A, keys
transforms the graph, with
these transformations reflected
in the equation.
The button labelled
25,*aa is a
toggle between
25,*aa and
(;75aa . When 25,*aa is
chosen, the ‘point of control’ is
at the origin (0,0) and the
*k,*e, and *>,*A, keys
control vertical and horizontal
transformations. When
(;75a a
is chosen the ‘point of control’ is on the first extremum of the
graph (i.e. for the sine graph at .
The arrow keys change the
amplitude and frequency of the
graph. This is most easily seen
by experimenting.
Pressing >6<0%@ displays the
equation at the top of the
screen. The equation is
controls the graph. Pressing the
*A, and *>, keys moves from
parameter to parameter.
Pressing the *k, or *e, key changes the parameter’s values.
The default angle setting for this aplet is radians. The angle
setting can be changed to degrees by pressing
5$'aa .
ya bxc+()d+sin=
Origin
π 21,⁄()
Extremum

HP 39G Specifications

General

Brand	HP
Model	39G
Category	Calculator
Language	English