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#### Cos

Declaration:
  Function Cos (X : Real) : Real;
Description:
  Cos returns the cosine of X, where X is an angle, in radians.

  If the absolute value of the argument is larger than 2^63, then the result is undefined.

Errors:
  None.
See also:
  Arctan (453), Sin (574)

Listing: refex/ex12.pp

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.

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