HP Prime Graphing Wireless Calculator Instrukcja Użytkownika Pobierz pdf (Strona 200)

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Tap on the tangent to select it. After the tangent is selected, the new menu key appears. Tap

or press , and then select Choose color.

4. Pick a color, and then tap on a blank area of the screen to see the new color of the tangent line.

5. Tap point B and drag it along the curve; the tangent moves accordingly. You can also drag the tangent

line itself.

Tap point B and then press to select the point. The point turns light blue to show that it has

been selected. Now, you can either drag the point with your nger or use the cursor keys for ner control

of the movement of point

B. To deselect point B, either press or tap point B and press

Note that whatever you do, point B remains constrained to the curve. Moreover, as you move point B, the

tangent moves as well. If it moves o the screen, you can bring it back by dragging your nger across the

screen in the appropriate direction.

Creating a derivative point

The derivative of a graph at any point is the slope of its tangent at that point. We’ll now create a new point

that will be constrained to point B and whose ordinate value is the derivative of the graph at point B. We’ll

constrain it by forcing its x coordinate (that is, its abscissa) to always match that of point B, and its y

coordinate (that is, its ordinate) to always equal the slope of the tangent at that point.

To dene a point in terms of the attributes of other geometric objects, press to go to Symbolic

view.

Note that each object you have so far created is listed in Symbolic view. Note too that the name for an

object in Symbolic view is the name it was given in Plot view but prexed with a “G”. Thus the graph—

labeled A in Plot view—is labeled GA in Symbolic view.

152 Chapter 9 Geometry

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