Casio fx-991ZA PLUS II User Manual

Note
• The following cannot be used in f(x): Pol, Rec, ÷R. The following cannot be used in
f(x), a, or b: ∫, d/dx, Σ.
Rectangular-Polar Coordinate
Conversion
Pol converts rectangular coordinates to polar coordinates, while Rec
converts polar coordinates to rectangular coordinates.
(1) Rectangular Coordinates (Rec)
(2) Polar Coordinates (Pol)
Specify the angle unit before performing calculations.
The calculation result for r and θ and for x and y are each assigned
respectively to variables X and Y.
Calculation result θ is displayed in the range of -180° < θ ≦ 180°.
Example 1: To convert rectangular coordinates (√
2; √2) to polar
coordinates (Angle unit: Deg)
(MthIO-MathO)
(Pol) 2 (;) 2
r = 2; θ = 45
(LineIO)
(Pol) 2 (;) 2
r = 2
θ = 45
Example 2: To convert polar coordinates (√2; 45°) to rectangular
coordinates (Angle unit: Deg)
(MthIO-MathO)
37

Casio fx-991ZA PLUS II Specifications

General

Type	Scientific Calculator
Number of Functions	552
Equation Solver	Yes
Matrix Calculations	Yes
Complex Number Calculations	Yes
Integration	Yes
Differentiation	Yes
Memory	9 variables
Weight	95 g
Protective Case	Yes
Display	Natural Textbook Display
Power Source	Solar and Battery