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ArcTan

Synopsis


function ArcTan (x: Real): Real;
or
function ArcTan (z: Complex): Complex;

Description

ArcTan returns the (principal value of the) arcus tangent of the argument. The result is in the range -Pi / 2 < ArcTan (x) < Pi / 2 for real arguments.

Conforming to

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

Example


program ArcTanDemo;
begin
  { yields 3.14159 as ArcTan (1) = Pi / 4 }
  WriteLn (4 * ArcTan (1) : 0 : 5)
end.

See also

Sin, Cos, Ln, Arg.