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HP 39gII Quick Start Manual page 53

Graphing calculator
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Table 17 Trig Explorer App Summary
Summary of Functionality
Press the GRAPH/EQ menu key to toggle it to EQ mode. In this mode, you can change the
parameters of the equation directly and observe the effect on the shape of the graph. The
active keys are:
• Use the left- and right-cursor keys to select a parameter
• Use the up- and down-cursor keys to increase and decrease the selected parameter's
value.
• Use the (-) key to change the sign of the parameter a
The increments in EQ mode behave the same way as in GRAPH mode. Press the GRAPH/
EQ menu key to toggle back to this mode at any time.
Press the TEST menu key to enter the Test view of the app. In the Test view, you can test your
skill at matching an equation to the graph shown. Test view is like EQ mode in that you use
the cursor keys to select and change the value of each parameter in the equation to match
the graph shown. When you are done, press the CHECK menu key to check if your answer
is correct. The menu keys are:
• RAD/DEG: chooses the angle measure for your test
/n (or n ): chooses the increment for your test
π
°
• LEVn: chooses the level for your test
• CHECK: checks your current answer against the correct answer
• ANSW: displays the correct answer
• END: returns to the Plot view to explore
Managing the Apps Library
As shown in the previous App summaries, the HP 39gII comes with a set of 15 built-in HP Apps. These Apps are in Read-Only Memory
(ROM) and cannot be deleted, so pressing the Apps key will always give you access to at least 15 Apps. However, you can add and
View Name and Display
EQ Mode
Test View
HP Apps: Solvers and Explorers
47

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