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The most powerful feature of the hp 39g+ is that you can download aplets
and programs from the internet to help you to learn and to do mathematics.
Two quick examples of aplets that are available are shown here. More are
listed in the supplementary appendix on "Teaching Calculus using the
hp 39g+". Notice that in each case the aplet is controlled by a menu. This
menu is created by the programmer and 'attached' to the VIEWS button so
that it displays in place of the normal menu.
Curve Areas
This aplet allows the user to find
approximations to the area under a curve by
finding either the lower rectangular area, the
upper rectangular area, or the trapezoidal area.
The user can choose the end points of the interval,
the type of calculation and the number of rectangles
to be used. The rectangles are drawn on the screen. A worksheet
introduces the idea of integration to find areas.
Linear Programming
This aplet visually solves linear
programming problems, finding the vertices
of the feasible region and the max/min of
an objective function. The final stage of
finding the vertices is a bit slow on an hp 39g but
more acceptable on an hp 39g+.
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