[Overview][Constants][Types][Classes][Procedures and functions][Variables] Reference for unit 'System' (#rtl)

cos

Calculate cosine of angle

Declaration

Source position: mathh.inc line 56

function cos(

  d: ValReal

):ValReal;

Description

Cos returns the cosine of X, where X is an angle, in radians. If the absolute value of the argument is larger than \var{2\^{}63}, then the result is undefined.

Errors

None.

See also

Arctan

  

Calculate inverse tangent

Sin

  

Calculate sine of angle

Example

Program Example12;

{ Program to demonstrate the Cos function. }

Var R : Real;

begin
  R:=Cos(Pi);    { R:=-1 }
  R:=Cos(Pi/2);  { R:=0  }
  R:=Cos(0);     { R:=1  }
end.