cosh.php

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<?php

namespace Complex;

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

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

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