Casio fx-9750G Differential/Quadratic Differential, Inte Bedienungsanleitung PDF herunterladen (Seite 6)

This average, which is called the

central difference

, is expressed as:

uTo perform a differential calculation

Example To determine the derivative at point x = 3 for the function

y = x

+ 4x

+ x – 6, when the increase/decrease of x is defined as

∆x = 1E – 5

Input the function

f(x).

AK4(CALC)2(d/dx)

vMd+evx

+v-g,

Input point

x = a for which you want to determine the derivative.

Input ∆

x, which is the increase/decrease of x.

bE-f)

• In the function f(x), only X can be used as a variable in expressions. Other vari-

ables (A through Z, r,

) are treated as constants, and the value currently as-

signed to that variable is applied during the calculation.

• Input of ∆

x and the closing parenthesis can be omitted. If you omit ∆x, the calcu-

lator automatically uses a value for ∆x that is appropriate for the derivative value

you are trying to determine.

• Discontinuous points or sections with drastic fluctuation can adversely affect pre-

cision or even cause an error.

1 f (a + ∆x) – f (a) f (a) – f (a – ∆x)

f '(a) = ––

––––––––––––– + –––––––––––––

2∆x ∆x

f (a + ∆x) – f (a – ∆x)

= –––––––––––––––––

2∆x

3 - 3 Differential Calculations

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Casio fx-9750G Differential/Quadratic Differential, Inte Bedienungsanleitung Seite 6