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## 9.12 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

section 9.255 Sin, section 9.54 Cos, section 9.135 Ln, section 9.13 Arg.

This document was generated by Frank Heckenbach on May, 10 2002 using texi2html