cos.php

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<?php

namespace Complex;

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

        if ($complex->isReal()) {
            return new Complex(\cos($complex->getReal()));
        }

        return conjugate(
            new Complex(
                \cos($complex->getReal()) * \cosh($complex->getImaginary()),
                \sin($complex->getReal()) * \sinh($complex->getImaginary()),
                $complex->getSuffix()
            )
        );
    }
}