Finding A Numerical Derivative - Casio fx-9860GII Instructions Manual

F5
SHIF T
Press G-Solv.
Press F3 MIN to fi nd the minimum point.
The calculator displays the local minimum at the point (2.23, −7.24).

2.4 Finding a numerical derivative

Using the calculator it is possible to fi nd the numerical value of any derivative
for any value of x. The calculator will not, however, differentiate a function
algebraically. This is equivalent to fi nding the gradient at a point graphically
(see Section 2.1 example 29).
Example 32
+ 3
x
d y
=
If y , evaluate
x
d x
MENU
Press . You will see the dialog box as shown on the right.
Choose 1: RUN·MAT and press
Press EXIT until you see the menu on the right, then press
d
Press to open the differentiation template.
F4
dx
The calculator shows that the value of the fi rst derivative of y
−0.75 when x = 2.
© Oxford University Press 2012: this may be reproduced for class use solely for the purchaser's institute
x =2
EXE
.
Casio fx-9860GII
F4 MATH.
+ 3
x
=
is
x
Using a graphic display calculator 31