Casio fx-3650P

19
12 Definite Integrals
(Trapezoidal rule)
Approximations of the value of definite integrals may be obtained as follows:
:number of trapezoids
For larger the approximation improves, and as
tends to infinity it agrees with the precise value of
the definite integral.
Program
？→ 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 [
Ａ , Ｂ ] Ｃ: number of trapezoids
OUTPUT Ｙ : value of the definite integral
Execution Example:
Calculate the value of the definite integral .
x()xd
A
B
∫
h
2
---
fA() 2fA h+()2fA 2h+()
…
2fB h–()fB()++ +++()≈
h
BA–
n
-------------= n
b
a
nn
ON
MODE MODE MODE
1
PRGM
MODE
1
COMP
1
P1
xxd
0
10
∫
10
20
3
-------------- 21.08185107==
Prog
1
S A
D R P1
P1
P2 P3 P4 G
0
EXE
S A
D R P1
P1
P2 P3 P4 G
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