Operation Manual

3-24 Function Graphing
8203FUNC.DOC TI-82, Chapter 3, English Bob Fedorisko Revised: 02/09/01 9:06 AM Printed: 02/09/01
12:36 PM Page 24 of 24
dy/dx
dy/dx
(numerical derivative,
CALC
item
6
) finds the numerical derivative
(slope) of a function at a point with
H
= 1
E
L
3.
1. Select
dy/dx
from the
CALC
menu. The current graph is displayed.
2. Move the cursor to the
X
value at which you want to calculate the
derivative and press
Í
.
The result cursor is on the solution and the coordinate values are displayed
(even if you have selected
CoordOff
on the
WINDOW FORMAT
screen).
When you press
|
,
~
,
}
, or
†
, the free-moving cursor appears.
‰
f(x)dx
‰
f(x)dx
(numerical integral,
CALC
item
7
) finds the numerical integral of a
function a specified interval. It uses the
fnInt(
function, with a tolerance of
1
E
L
3.
1. Select
‰
f(x)dx
from the
CALC
menu. The current graph is displayed, with
a prompt to enter
Lower Bound
.
2. Use
†
or
}
to move the cursor to the function for which you want to
calculate the integral.
3. Set
Lower Limit
and
Upper Limit
as described for
root
.
The integral value is displayed and the integrated area is shaded. When you
press
|
,
~
,
}
, or
†
, the free-moving cursor appears.
Note: The shaded area is a drawing. Use
ClrDraw
or any change that
invokes Smart Graph to clear the shaded area. (Chapter 8)