HP Prime Graphing Calculator User Manual
Page 143
Geometry
139
point B (referred to as GB in Symbolic view) and the later
is to constrained to the slope of C (referred to as GC in
Symbolic view).
19. You should have point() on the entry line. Between
the parentheses, add:
abscissa(GB),slope(GC)
You can enter the commands by hand, or choose them from
one of two Toolbox menus: App > Measure, or
Catlg
.
20.Tap .
The definition of your
new point is added to
Symbolic view. When
you return to Plot view,
you will see a point
named D and it will
have the same x-
coordinate as point B.
21. Press
P
.
If you can’t see point D,
pan until it comes into
view. The y coordinate
of D will be the
derivative of the curve at
point B.
Since its difficult to read
coordinates off the screen, we’ll add a calculation that
will give the exact derivative (to three decimal places)
and which we can display in Plot view.
Add some
calculations
22. Press
M
.
Numeric view is where you enter calculations.
23. Tap .
24.Tap
and choose Measure > slope
25.Between parentheses, add the name of the tangent,
namely GC, and tap
.
Notice that the current slope is calculated and displayed.
The value here is dynamic, that is, if the slope of the