HP 40G User Manual page 24

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Trig Explorer
The Trig Explorer aplet is used to investigate the behaviour
aplet of the graph of
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
in the
shown right is displayed.
In this mode, the graph
controls the equation. Pressing
the
transforms the graph, with
these transformations reflected
in the equation.
The button labelled
toggle between
@YUS——
chosen, the 'point of control' is
at the origin (0,0) and the
control vertical and horizontal
transformations. When
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
equation at the top of the
screen. The equation is
controls the graph. Pressing the
parameter to parameter.
Pressing the
The default angle setting for this aplet is radians. The angle
setting can be changed to degrees by pressing
1-14
manuals search engine
( )
y = a sin bx + c + d
TU6SU—
view, the screen
6QG@U—
and keys
is a
PSDB——
and
PSDB——
Origin
. When is
PSDB——
and keys
@YUS——
( π 2 1 , ⁄
displays the
and keys moves from
or key changes the parameter's values.
as the values of a, b, c
)
.
Extremum
.
S69——
Getting started