Complex number calculations (cmplx), Cmplx mode calculation examples – Casio fx-991ES PLUS User Manual
Page 19
E-18
To generate random integers in the range of 1 to 6
(RanInt) 1 (,) 6
2
6
1
(Results shown here are for illustrative purposes only. Actual results will differ.)
To determine the number of permutations and combinations
possible when selecting four people from a group of 10
Permutations:
10
(nPr) 4
5040
Combinations:
10
(nCr) 4
210
To perform the following calculations when Fix 3 is selected for the
number of display digits: 10 ÷ 3
s 3 and Rnd(10 ÷ 3) s 3 1
(SETUP)(Fix)
10
3 3
10.000
(Rnd) 10 3 3
9.999
Complex Number Calculations
(CMPLX)
To perform complex number calculations, first press
(CMPLX) to
enter the CMPLX Mode. You can use either rectangular coordinates (
a
+
bi
)
or polar coordinates (
r
θ) to input complex numbers. Complex number
calculation results are displayed in accordance with the complex number
format setting on the setup menu.
(2 + 6
i
) ÷ (2
i
) = 3 –
i
(Complex number format:
a
+
bi
)
2 6 $(
i
)
2 $(
i
)
3–
i
2
'
2 +
'
2
i
B (Complex number format:
a
+
bi
)
2
() 45
'
2 +
'
2
i
'
2 +
'
2
i
= 2
r
θ
)
i
)
2
45
Note: • If you are planning to perform input and display of the calculation
result in polar coordinate format, specify the angle unit before starting the
calculation. • The
θ
value of the calculation result is displayed in the range
of –180°
θ
is selected will show
a
and
bi
(or
r
and
θ
) on separate lines.
CMPLX Mode Calculation Examples
(1
–
i
)
–1
= 1
2
1
2
+
i
(Complex number format:
a
+
bi
)
1 $(
i
)
1
2
1
2
+
i
(1
+
i
)
2
+ (1 –
i
)
2
= 0
1 $(
i
)
7 1 $(
i
)
7
0
15
15
16
16
17
17