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# atan2

Perl 5 version 18.2 documentation
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# atan2

Perl functions A-Z | Perl functions by category | The 'perlfunc' manpage

- atan2 Y,X

  Returns the arctangent of Y/X in the range -PI to PI.

  For the tangent operation, you may use the `Math::Trig::tan` function, or use the familiar relation:

          sub tan { sin($_[0]) / cos($_[0])  }

  The return value for `atan2(0,0)` is implementation-defined; consult your atan2(3) manpage for more information.

  Portability issues: atan2 in perlport.