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  1. or download this
    my $radians_wrapped_by_2pi = Math::Trig::rad2rad($radians);
  2. or download this
    use Modern::Perl;
use Math::Trig ':pi';
...
my $radians_wrapped_by_2pi = Math::Trig::rad2rad($radians);

say 'rad2rad(', $radians, ') = ', $radians_wrapped_by_2pi;
  3. or download this
     1:49 >perl 502_SoPW.pl
rad2rad(14.1371669411541) = 1.5707963267949

 1:49 >