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Geometry 141
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.
35.Press
M to return to Numeric view.
36.Select each calculation in turn and tap . All
calculations should now be deselected.
37. Press
P to return to Plot view.
38.Press E and select point GD.
39. Tap and select More > Trace
40.Press
E and select point GB.
41. Using the cursor keys,
move B along the curve.
You will notice that a
shadow curve is traced
out as you move B. This
is the curve of the
derivative of 3sin(x).
Plot view in detail
In Plot view you can directly
draw objects on the screen
using various drawing tools.
For example, to draw a
circle, tap and select
Circle. Now tap where
you want the center of the
circle to be and press
E. Next, tap a point that is to be on the circumference
and press
E. A circle is drawn with a center at the
location of your first tap, and with a radius equal to the
distance between your first tap and second tap.
Creating or selecting an object always involves at least two
steps: tap and press
E. Only by pressing E do
you confirm your intention to create the point or select an