DelphiBasics
ArcSin
Function
The Arc Sine of a number, returned in radians Math unit
 function ArcSin ( const Number : Extended ) : Extended;
Description
The ArcSin function is a mathematical function giving the value in radians of the Arc Sine of Number.
 
PI radians  = 180 degrees
Notes
The System unit supports only the following angular functions:

ArcTan
Sin
Cos

Related commands
ArcCos The Arc Cosine of a number, returned in radians
ArcTan The Arc Tangent of a number, returned in radians
Cos The Cosine of a number
Sin The Sine of a number
Tan The Tangent of a number
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Example code : The ArcSin of 0.5 gives 30 degrees
// Full Unit code.
// -----------------------------------------------------------
// You must store this code in a unit called Unit1 with a form
// called Form1 that has an OnCreate event called FormCreate.
 
unit Unit1;
 
interface
 
uses
  Math,   // Unit containing the ArcSin command
  SysUtils,
  Forms, Dialogs;
 
type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  end;
 
var
  
Form1: TForm1;
 
implementation
{$R *.dfm} // Include form definitions
 
procedure TForm1.FormCreate(Sender: TObject);

var
  float : single;
begin
  // The ArcSin of 0.5 should give 30 degrees
  float := ArcSin(0.5);
  float := RadToDeg(float);  // Convert result to degrees
  ShowMessage('ArcSin of 0.5 = '+FloatToStr(float)+' degrees');
end;
 
end.
Hide full unit code
   ArcSin of 0.5 = 30 degrees
 
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