HP Prime Graphing NW280AAABA manual Create a, Derivative point

	finger completes the move and deselects the point. In this case
	there is no way to cancel the move unless you have activated
	keyboard shortcuts, which provides you with an undo
	function. (Shortcuts are described on page 147.)
Create a	The derivative of a graph at any point is the slope of its
derivative point	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.
	16. To define a point in
	terms of the attributes of
	other geometric objects,
	you need to go to
	Symbolic view:
	Y
	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 prefixed with a “G”. Thus the graph—labeled A
	in Plot view—is labeled GA in Symbolic view.
	17. Highlight GC and tap		.
	When creating objects that are dependent on other
	objects, the order in which they appear in Symbolic view
	is important. Objects are drawn in Plot view in the order
	in which they appear in Symbolic view. Since we are
	about to create a new point that is dependent on the
	attributes of GB and GC, it is important that we place its
	definition after that of both GB and GC. That is why we
	made sure we were at the bottom the list of definitions
	before tapping		. If our new definition appeared
	higher up in Symbolic view, the point we are about to
	create wouldn’t be drawn in Plot view.
	18. Tap	and choose Point > point
	You now need to specify the x and y coordinates of the
	new point. The former is to be constrained to abscissa of

138 Geometry