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The most powerful feature of the hp 39gs & hp 40gs 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 39gs & hp
40gs” and examples are also given in the chapter on programming. 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.
It even performs sensitivity analysis on the
collected vertices.
Sine Define
This is an aplet to illustrate the process of obtaining the sine,
cosine & tangent graphs from the unit circle.
Periodic Table
This is a library that can be added to the calculator which allows the user to display
a periodic table with information on each element.
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