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<?php /** * * Function code for the complex tanh() function * * @copyright Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex) * @license https://opensource.org/licenses/MIT MIT */ namespace Complex; /** * Returns the hyperbolic tangent of a complex number. * * @param Complex|mixed $complex Complex number or a numeric value. * @return Complex The hyperbolic tangent of the complex argument. * @throws Exception If argument isn't a valid real or complex number. * @throws \InvalidArgumentException If function would result in a division by zero */ if (!function_exists(__NAMESPACE__ . '\\tanh')) { function tanh($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() ); } }