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Casio fx-991ZA PLUS II User Manual

Casio fx-991ZA PLUS II
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CMPLX Mode Calculation Examples
Example 1: (1 - i)
-1
=
1
2
+
1
2
i (MthIO-MathO) (Complex number format: a
+bi)
1 (i)
1
2
+
1
2
i
Example 2: (1 + i)
2
+ (1 - i)
2
= 0 (MthIO-MathO)
1 (i) 1 (i)
0
Example 3: To obtain the conjugate complex number of 2 + 3i
(Complex number format: a+bi)
(CMPLX) (Conjg) 2 3 (i) 2-3i
Example 4: To obtain the absolute value and argument of 1 + i (MthIO-
MathO) (Angle unit: Deg)
Absolute Value (Abs):
(Abs) 1 (i)
2
Argument (arg):
(CMPLX) (arg) 1 (i)
45
Using a Command to Specify the Calculation
Result Format
Either of two special commands (
rθ or a+bi) can be input at the end
of a calculation to specify the display format of the calculation results.
The command overrides the calculator's complex number format setting.
Example:
2 + 2i = 245, 245 = 2 + 2i (MthIO-MathO) (Angle unit:
Deg)
2 2 (i) (CMPLX)
( rθ)
245
2 () 45 (CMPLX) ( a+bi) 2+√2i
Statistical Calculations (STAT)
To start a statistical calculation, perform the key operation
(STAT)
to enter the STAT Mode and then use the screen that appears to select the
type of calculation you want to perform.
49

Table of Contents

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Casio fx-991ZA PLUS II Specifications

General IconGeneral
TypeScientific Calculator
Number of Functions552
Equation SolverYes
Matrix CalculationsYes
Complex Number CalculationsYes
IntegrationYes
DifferentiationYes
Memory9 variables
Weight95 g
Protective CaseYes
DisplayNatural Textbook Display
Power SourceSolar and Battery

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