tanh.php

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<?php

namespace Complex;

if (!function_exists(__NAMESPACE__ . '\\tanh')) {
    function tanh($complex): Complex
    {
        $complex = Complex::validateComplexArgument($complex);
        $real = $complex->getReal();
        $imaginary = $complex->getImaginary();
        $divisor = \cos($imaginary) * \cos($imaginary) + \sinh($real) * \sinh($real);
        if ($divisor == 0.0) {
            throw new \InvalidArgumentException('Division by zero');
        }

        return new Complex(
            \sinh($real) * \cosh($real) / $divisor,
            0.5 * \sin(2 * $imaginary) / $divisor,
            $complex->getSuffix()
        );
    }
}