Casio FX-CG10 User Manual Page 74

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2-28
In this definition, infinitesimal is replaced by a sufficiently small A
x , with the value in the
neighborhood of f
'
( a ) calculated as:
Example To determine the derivative at x = 3 for the function y = x
3
+ 4 x
2
+ x – 6
Input the function f ( x ).
AK4(CALC) 2( d / d
x ) vMde+evx+v-ge
Input point
x = a for which you want to determine the derivative.
dw
Using First Derivative Calculation in a Graph Function
You can omit input of the value a in the syntax on page 2-27 by using the following format
for the first derivative graph: Y2 = d / dx (Y1). In this case, the value of the X variable is used
instead of the value a.
First Derivative Calculation Precautions
In the function f ( x ), only X can be used as a variable in expressions. Other variables
(A through Z excluding X,
r , ) are treated as constants, and the value currently assigned to
that variable is applied during the calculation.
• Pressing A during calculation of a first derivative (while the cursor is not shown on the
display) interrupts the calculation.
Inaccurate results and errors can be caused by the following:
- discontinuous points in
x values
- extreme changes in
x values
- inclusion of the local maximum point and local minimum point in
x values
- inclusion of the inflection point in
x values
- inclusion of undifferentiable points in
x values
- first derivative calculation results approaching zero
Always use radians (Rad mode) as the angle unit when performing trigonometric first
derivatives.
You cannot use a first derivative, second derivative, integration, Σ , maximum/minimum value,
Solve or RndFix calculation expression inside a first derivative calculation term.
f
(
a
+
A
x
)–
f
(
a
)
f
(
a
)
–––––––––––––
A
x
'
f
(
a
+
A
x
)–
f
(
a
)
f
(
a
)
–––––––––––––
A
x
'
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