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  1. or download this
    #!perl
use warnings; use strict; use 5.010;
...
}

__END__
  2. or download this
    Newton iteration, using Taylor series of sine and cosine.
pi = 3.141592653589793238462643383279502884197169399375105820974942;
Using Taylor series of arctangent.
pi = 3.141592653589793238462643383279502884197169399375105820974945;