RAD Studio VCL Reference
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System.Cos Function

Calculates the cosine of an angle.

Pascal
function Cos(const X: Extended): Extended;
C++
Extended Cos(const Extended X);

System

In Delphi code, Cos returns the cosine of the angle X. 

X is a real-type expression that represents an angle in radians.  

Delphi Examples: 

 

{
This example displays the Cosine of any value between 0 and
12.  Since the scrollbar position is an integer between the
scrollbar  min and max, multiply the range and divide the
position to fine tune it.  With the scrollbar selected use
the left and right buttons to change the position by 1E-6.
Or use the Dec function to decrement (or increment) by a
specific amount.
}
procedure TForm1.Button1Click(Sender: TObject);
var
  new : Integer;
begin
  new := ScrollBar1.Position;
  System.Dec(new, Round(StrToFloat(Edit3.Text)*1000000));
  ScrollBar1.Position := new;
  Edit1.Text := FloatToStr(ScrollBar1.Position/1000000);
  Edit2.Text := FloatToStr(Cos(ScrollBar1.Position/1000000));
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  ScrollBar1.Max := Round(Pi * 4000000);   // 4 * Pi
end;

procedure TForm1.ScrollBar1Scroll(Sender: TObject; ScrollCode: TScrollCode;
  var ScrollPos: Integer);
begin
  Edit1.Text := FloatToStr(ScrollPos/1000000);
  Edit2.Text := FloatToStr(Cos(ScrollPos/1000000));
end;

 

ArcCos 

Sin 

Tan 

Cosh

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