Definite Integrals(Trapezoidal Rule) - Casio fx-3650P Programming Manual

12 Definite Integrals
Approximations of the value of definite integrals may be obtained as follows:
B
h
∫
x ( ) x d ≈ -- - f A ( ) (
+
2
A
h =
n
For larger the approximation improves, and as
tends to infinity it agrees with the precise value of
the definite integral.
ON MODE MODE
？→ Ａ：？→ Ｂ：？→ Ｃ：１→ Ｄ： （√ Ａ）÷２→ Ｙ：Ｌｂｌ １： （Ａ（Ｃ － Ｄ）＋ ＤＢ）
÷ Ｃ → Ｘ：Ｙ ＋（√ Ｘ）→ Ｙ：Ｄ ＋１→ Ｄ：Ｄ ≠ Ｃ ⇒ Ｇｏｔｏ １：Ｙ ＋（√ Ｂ）÷２→
Ｙ： （Ｂ － Ａ）Ｙ ÷ Ｃ → Ｙ：Ｙ ＜ 89 STEP ＞
INPUT Ａ,Ｂ : interval of integration [
OUTPUT Ｙ : value of the definite integral
Calculate the value of the definite integral
Prog 1
0 EXE
( ) (
2f A + h + 2f A +
B A –
------------ - n
:number of trapezoids
n
PRGM
MODE
(Trapezoidal rule)
...
) (
2h + + 2f B h –
n
COMP
1 1
MODE
, ] Ｃ: number of trapezoids
Ａ Ｂ
10
20
10
∫
x x d = ------------- -
3
0
S A
S A
) f B ( ) )
+
a
1
= 21.08185107
.
P1 P1 P2 P3 P4 D R
P1 P1 P2 P3 P4 D R
b
G
G
19