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### Cos

#### Synopsis

    function Cos (x: Real): Real;

or

    function Cos (z: Complex): Complex;

#### Description

`Cos` returns the cosine of the argument. The result is in the range `-1 < Cos (x) < 1` for real arguments.

#### Conforming to

The function `Cos` is defined in ISO 7185 Pascal; its application to complex values is defined in ISO 10206 Extended Pascal.

#### Example

    program CosDemo;
    begin
      { yields 0.5 since Cos (Pi / 3) = 0.5 }
      WriteLn (Cos (Pi / 3) : 0 : 5)
    end.

#### See also

ArcTan, Sin, Ln, Arg.