ArcCos

Synopsis

     function ArcCos (x: Real): Real;

or

     function ArcCos (z: Complex): Complex;

Description

ArcCos returns the (principal value of the) arcus cosine of the argument. The result is in the range 0 < ArcCos (x) < Pi for real arguments.

Conforming to

ArcCos is a GNU Pascal extension.

Example

     program ArcCosDemo;
     begin
       { yields 3.14159 as ArcCos (0.5) = Pi / 3 }
       WriteLn (3 * ArcCos (0.5) : 0 : 5)
     end.

See also

ArcSin, ArcTan, Sin, Cos, Ln, Arg.