Scientific Calculations; Trigonometric And Inverse Trigonometric Functions - Casio FX-890P Owner's Manual

3.1 Scientific Calculations

The scientific functions can be used either with BASIC programs or for manual
calculations. For the sake of the explanation, all the examples here will cover only
manual calculations.

3.1.1 Trigonometric and Inverse Trigonometric Functions

SIN (Sine), COS (Cosine), TAN (Tangent),
ARCSIN (Arc Sine), ARCCOS (Arc Cosine), ARCTAN (Arc Tangent).
These functions return a trigonometric function value for a given angle, or an angle
value of a given trigonometric function value. The ANGLE command should be used
to specify the unit for the angle value when these functions are used. Angle unit
specification is only required once for all subsequent trigonometric / inverse
trigonometric functions. Angle units can be specified using either the MODE
command or the ANGLE command.
• DEG (Degrees)
• RAD (Radians)
• GRAD (Grads)
It is as well possible to use the MENU 7.
The relationship among these three specifications is:
90 Degrees = π/2 Radians = 100 Grads
The current angle unit is retained when the power of the unit is switched OFF, and
the angle unit becomes ANGLE0 (DEG) when ALL RESET button is pressed.
The value for π can be directly entered into a formula using "PI" (3.141592654).
EXAMPLE 1:
sin (30°) = 0.5
OPERATION:
Shift ANGLE 0 .
sin 30 . .
EXAMPLE 2:
cos (π/3) = 0.5
OPERATION:
Shift ANGLE 1 .
cos ( π / 3 ) .
ANGLE0
ANGLE1
ANGLE2
.
.
.
ANGLE 0
SIN30
0.5
ANGLE 1
COS(PI/3)
0.5
21
MODE4
MODE5
MODE6