csc.php

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<?php
 
namespace Complex;
 
if (!function_exists(__NAMESPACE__ . '\\csc')) {
    function csc($complex): Complex
    {
        $complex = Complex::validateComplexArgument($complex);
 
        if ($complex->getReal() == 0.0 && $complex->getImaginary() == 0.0) {
            return new Complex(INF);
        }
 
        return inverse(sin($complex));
    }
}