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  1. or download this
    double cos( double x )
/* No need to write the trivial XS wrapper, just the declaration */
  2. or download this
    package Math::MyWrapper;
use Math::MyWrapper::XS();
...
    return Math::MyWrapper::XS::cos( $x );
}
...
  3. or download this
    package Math::MyWrapper::Class;
use Math::MyWrapper();
...
        or  die "Error building $sub method: $@\n";
}
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