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  1. or download this
    my $formula = 'c + a * x^2';
  2. or download this
    $ perl -MO=Deparse,-p -e 'my $formula = $c + $a * $x**2;'
(my $formula = ($c + ($a * ($x ** 2))));
-e syntax OK
  3. or download this
    $ perl -MO=Deparse,-p -e 'my $formula = $c + $a * $x^2;'
(my $formula = (($c + ($a * $x)) ^ 2));
-e syntax OK