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<?php |
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|
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/** |
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* |
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* Function code for the complex cos() function |
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* |
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* @copyright Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex) |
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* @license https://opensource.org/licenses/MIT MIT |
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*/ |
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namespace Complex; |
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|
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/** |
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* Returns the cosine of a complex number. |
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* |
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* @param Complex|mixed $complex Complex number or a numeric value. |
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* @return Complex The cosine of the complex argument. |
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* @throws Exception If argument isn't a valid real or complex number. |
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*/ |
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function cos($complex) |
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{ |
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$complex = Complex::validateComplexArgument($complex); |
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|
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if ($complex->isReal()) { |
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return new Complex(\cos($complex->getReal())); |
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} |
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|
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return conjugate( |
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new Complex( |
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\cos($complex->getReal()) * \cosh($complex->getImaginary()), |
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\sin($complex->getReal()) * \sinh($complex->getImaginary()), |
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$complex->getSuffix() |
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) |
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); |
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} |
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|
