Casio fx-991ZA Plus - Page 20

EN-19
To calculate ln 90 (= log
e
90) to three significant digits (Sci 3)
1N(SETUP)7(Sci)3 i 90 )=
4.50×10
0
1.2 × 10
3
= 1200 B 1.2 * 10 6 3 = 1200
(1+1)
2+2
= 16 B ( 1 + 1 )6 2 + 2 = 16
(5
2
)
3
= 15625 ( 5 x)1w(x
3
)= 15625
32
5
= 2 B 16(") 5 e 32 = 2
b 516(") 32 )= 2
To calculate
'
2
×
3
(= 3
'
2
= 4.242640687...) to three decimal
places (Fix 3)
1N(SETUP)6(Fix)3 B ! 2 e* 3 =
3
'
2
1= 4.243
b ! 2 )* 3 = 4.243
∫
1
e
ln(x)dx = 1
B 7iS)(X))e 1 eS5(
e)= 1
b 7iS)(X))1)(,)
1 1)(,)S5(
e))= 1
To obtain the derivative at point x = π/2 for the function y = sin(x)
V
B 17(F)sS)(X))
e'15(π)e 2 =
0
b 17(F)sS)(X))
1)(,)15(π)' 2 )=
0
Σ
x
=
1
5
(x + 1) = 20
B 1&(8)S)(X)+ 1 e 1 e 5 =
20
b 1&(8)S)(X)+ 1 1)(,) 1
1)(,) 5 )=
20
To convert rectangular coordinates (
'
2
,
'
2
) to polar coordinates
v
B 1+(Pol)! 2 e1)(,)! 2 e)=
r=2,=45
b 1+(Pol)! 2 )1)(,)! 2 ))= r= 2
= 45
To convert polar coordinates (
'
2
, 45°) to rectangular coordinates
v
B 1-(Rec)! 2 e1)(,) 45 )=
X=1, Y=1
(5 + 3) ! = 40320 ( 5 + 3 )1E(x!)= 40320
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