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• 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::tanfunction, or use the familiar relation:

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

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

  Portability issues: atan2 in perlport.