Texas Instruments -84 Plus, Manual Book

Page: 134 / 696

Chapter 3: Function Graphing 131
3. Press
|
or
~
(or enter a value) to select the X value at which to calculate the
derivative, and then press
Í
.
The cursor is on the solution and the numerical derivative is displayed.
To move to the same x-value for other selected functions, press
}
or
†
. To restore the
free-moving cursor, press
|
or
~
.
‰
f(x)dx f(x)dx f(x)dx f(x)dx
‰
f(x)dx
(numerical integral) finds the numerical integral of a function in a specified
interval. It uses the
fnInt(
function, with a tolerance of
H
=1
â
L
3.
To find the numerical integral of a function, follow these steps.
1. Select
7:
‰
f(x)dx
from the
CALCULATE
menu. The current graph is displayed with
Lower Limit?
in the bottom-left corner.
2. Press
}
or
†
to move the cursor to the function for which you want to calculate the
integral.