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<?php /** * * Function code for the complex cosh() 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 cosine of a complex number. * * @param Complex|mixed $complex Complex number or a numeric value. * @return Complex The hyperbolic cosine of the complex argument. * @throws Exception If argument isn't a valid real or complex number. */ function cosh($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() ); }
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