Texas Instruments TI-84 PLUS - Graphing Calculator Manual Book page 97

‰f(x)dx
(numerical integral) finds the numerical integral of a function in a specified interval. It uses
f(x)dx
‰
the function, with a tolerance of H=1âL3.
fnInt(
To find the numerical integral of a function, follow these steps.
1. Select from the
7: ‰ f(x)dx
in the bottom-left corner.
Lower Limit?
2. Press } or † to move the cursor to the function for which you want to calculate the integral.
3. Set lower and upper limits as you would set left and right bounds for
displayed, and the integrated area is shaded.
The shaded area is a drawing. Use
Note:
Graph to clear the shaded area.
menu. The current graph is displayed with
CALCULATE
ClrDraw
zero
(Chapter 8) or any action that invokes Smart
Chapter 3: Function Graphing
. The integral value is
90