rho.php

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<?php

namespace Complex;

if (!function_exists(__NAMESPACE__ . '\\rho')) {
    function rho($complex): float
    {
        $complex = Complex::validateComplexArgument($complex);

        return \sqrt(
            ($complex->getReal() * $complex->getReal()) +
            ($complex->getImaginary() * $complex->getImaginary())
        );
    }
}