Texas Instruments PLUS TI-89 - Manual (Page 141)

124 Chapter 6: Basic Function Graphing
06BASFUN.DOC TI-89/TI-92 Plus: Basic Function Graphing (English) Susan Gullord Revised: 02/23/01 4:09 PM Printed: 02/23/01 4:18 PM Page 124 of 22
1. From the Graph screen, press ‡ and select 6:Derivatives . Then
select 1:dy/dx from the submenu.
2. As necessary, use D and C to select the applicable function.
3. Set the derivative point.
Either move the cursor to the
point or type its
x value.
4. Press ¸.
The derivative at that point is
displayed.
1. From the Graph screen, press ‡ and select 7: ‰ f(x)dx .
2. As necessary, use D and C to select the applicable function.
3. Set the lower limit for x . Either use A and B to move the cursor
to the lower limit or type its x value.
4. Press ¸. A 4 at the top of the screen marks the lower limit.
5. Set the upper limit, and press
¸.
The interval is shaded, and its
approximate numerical
integral is displayed.
1. From the Graph screen, press ‡ and select 8:Inflection .
2. As necessary, use D and C to select the applicable function.
3. Set the lower bound for x . Either use A and B to move the cursor
to the lower bound or type its x value.
4. Press ¸. A 4 at the top of the screen marks the lower bound.
5. Set the upper bound, and
press ¸.
The cursor moves to the
inflection point (if any) within
the interval, and its
coordinates are displayed.
Finding the
Derivative (Slope) at
a Point
Finding the
Numerical Integral
over an Interval
Tip: Typing x values is a
quick way to set the limits.
Tip: To erase the shaded
area, press
† (ReGraph).
Finding an Inflection
Point within an
Interval