155
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
function has already been graphed in the
GRAPH Mode
.
Memory Area Y1 =
x
(
x
+ 2)(
x
– 2)
The following are the View Window parameters used when drawing the graph.
Xmin
= –5
Ymin
= –5
Xmax = 5
Ymax = 5
Xscale = 1
Yscale = 1
k
k
k
k
k
Tangent
[Sketch]
-
[Tang]
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
Example
To draw a line that is tangent to point (
x
= 2,
y
= 0) of
y
=
x
(
x
+ 2)
(
x
– 2)
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
want to draw the line.
3. Press
w
to draw the line.
P.112
Summary of Contents for CFX-9970G
Page 22: ... CFX 9970G ...
Page 452: ...435 1 2 3 4 5 Program for Circle and Tangents No 4 Step Key Operation Display ...
Page 453: ...436 Program for Circle and Tangents No 4 Step Key Operation Display 6 7 8 9 10 ...
Page 454: ...437 11 12 13 14 15 Program for Circle and Tangents No 4 Step Key Operation Display ...
Page 455: ...438 16 17 18 Program for Circle and Tangents No 4 Step Key Operation Display ...
Page 458: ...441 1 2 3 4 5 Program for Rotating a Figure No 5 Step Key Operation Display ...