Casio CFX-9970G User Manual page 83

3 - 2
Differential Calculations
This average, which is called the central difference , is expressed as:
u u u u u To perform a differential calculation
Example
Input the function
Input point
Input A
• In the function
variables (A through Z,
assigned to that variable is applied during the calculation.
• Input of A
calculator automatically uses a value for A
tive value you are trying to determine.
• Discontinuous points or sections with drastic fluctuation can adversely affect
precision or even cause an error.
f (a + Ax) – f (a)
1
f '(a) = –– –––––––––– ––– + –––––––––––––
Ax
2
f (a + Ax) – f (a – Ax)
= –––––––––– –––––––
2
Ax
To determine the derivative at point
y x x
3 + 4 2
= +
as A A A A A x
= 1 – 5
E
f(x)
.
AK4(CALC)2(
x a
= for which you want to determine the derivative.
d,
x
, which is the increase/decrease of
bE-f)
w
f(x)
, only X can be used as a variable in expressions. Other
r
, & ) are treated as constants, and the value currently
x
and the closing parenthesis can be omitted. If you omit A
f (a) – f (a – Ax)
Ax
x
– 6, when the increase/decrease of
d/dx
)vMd+evx+v-g,
x
.
x
that is appropriate for the deriva-
x
= 3 for the function
x
is defined
x
, the
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