Casio FX-9750G PLUS User's Manual & Technical Reference page 84

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
Input the function
Input point
Input A
56
1 f (a + Ax) – f (a)
f '(a) = –– –––––––––– ––– + –––––––––– –––
2
f (a + Ax) – f (a – Ax)
= –––––––––– –––––––
Example To determine the derivative at point
y x
+ 4
=
3
x
as A A A A A = 1
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)
• In the function , only X can be used as a variable in expressions. Other
variables (A through Z,
assigned to that variable is applied during the calculation.
x
• Input of A and the closing parenthesis can be omitted. If you omit 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) – f (a – Ax)
Ax
2
Ax
x x
– 6, when the increase/decrease of
+
2
– 5
E
d/dx
)vMd+evx+v-g,
x
.
, θ ) are treated as constants, and the value currently
r
Ax
x
= 3 for the function
x
that is appropriate for the deriva-
x
is defined
x
, the