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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 func-

tion 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 (f, c, d, e) to move the pointer the position of the

3. Press w to draw the line.

Memory Area Y1 =

Xmin

Xmax = 5

Xscale = 1

Example

To draw a line that is tangent to point (

(

– 2)

!4(Sketch)2(Tang)

point where you want to draw the line.

e ~ e

(

+ 2)(

– 2)

= –5

Ymin

Ymax = 5

Yscale = 1

= –5

= 2,

= 0) of

(

+ 2)

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