HP Prime Graphing Wireless Calculator - Manual (Page 15)

Geometry 11
31. Tap point B and then press E to select it.
32. Use the cursor keys to move point B along the graph.
Note that with each move, the results of the calculations
shown at the top left of the screen change. To deselect
point B, tap point B and then press
E .
Calculations in
Plot view
By default, calculations in Plot view are docked to the upper
left of the screen. You can drag a calculation from its dock and
position it anywhere you like; however, after being undocked,
the calculation scrolls with the display. Tap and hold a
calculation to edit its label. An edit line opens so that you can
enter your own label. You can also tap
and select a
different color for the calculation and its label. Tap
when you are done.
Trace the
derivative
Point D is the point whose ordinate value matches the
derivative of the curve at point B. It is easier to see how the
derivative changes by looking at a plot of it rather than
comparing subsequent calculations. We can do that by
tracing point D as it moves in response to movements of point
B.
First we’ll hide the calculations so that we can better see the
trace curve.
33.Press
M to return to Numeric view.
34.Select each calculation in turn and tap . All
calculations should now be deselected.
35.Press P to return to Plot view.
36.Tap point D and then press E to select it.
37. Tap (or press Z) and then select Trace. Press
E to deselect point D.
38.Tap point B and then press E to select it.
39. Using the cursor keys,
move point B along the
curve. Notice that a
shadow curve is traced
out as you move point B.
This is the curve of the