Graphing With The Sketch Function - Casio CFX-9970G Manual

10-2 Graphing with the Sketch Function

The sketch function lets you draw lines and plot points on a graph that is already
on the screen.
All the examples in this section that show operations in the STAT, GRAPH, TABLE,
RECUR, and CONICS Modes are based on the assumption that the following
P.112 function has already been graphed in the GRAPH Mode.
The following are the View Window parameters used when drawing the graph.
k k k k k Tangent
This function lets you draw a line that is tangent to a graph at any point.
u u u u u To draw a tangent in the GRAPH or TABLE Mode
1. After graphing the function, display the sketch menu and press 2 (Tang).
2. Use the cursor keys to move the pointer the position of the point where you
3. Press w to draw the line.
x
Memory Area Y1 =
Xmin
Xmax = 5
Xscale = 1
Example To draw a line that is tangent to point (
x
( – 2)
want to draw the line.
x x
( + 2)( – 2)
= –5 Ymin
Ymax = 5
Yscale = 1
= –5
[Sketch]-[Tang]
x y
= 2, = 0) of
y x x
= ( + 2)
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