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Differences Between: [Versions 310 and 311] [Versions 39 and 311]

   1  <?php
   2  
   3  /**
   4   *
   5   * Function code for the complex tanh() function
   6   *
   7   * @copyright  Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex)
   8   * @license    https://opensource.org/licenses/MIT    MIT
   9   */
  10  namespace Complex;
  11  
  12  /**
  13   * Returns the hyperbolic tangent of a complex number.
  14   *
  15   * @param     Complex|mixed    $complex    Complex number or a numeric value.
  16   * @return    Complex          The hyperbolic tangent of the complex argument.
  17   * @throws    Exception        If argument isn't a valid real or complex number.
  18   * @throws    \InvalidArgumentException    If function would result in a division by zero
  19   */
  20  function tanh($complex): Complex
  21  {
  22      $complex = Complex::validateComplexArgument($complex);
  23      $real = $complex->getReal();
  24      $imaginary = $complex->getImaginary();
  25      $divisor = \cos($imaginary) * \cos($imaginary) + \sinh($real) * \sinh($real);
  26      if ($divisor == 0.0) {
  27          throw new \InvalidArgumentException('Division by zero');
  28      }
  29  
  30      return new Complex(
  31          \sinh($real) * \cosh($real) / $divisor,
  32          0.5 * \sin(2 * $imaginary) / $divisor,
  33          $complex->getSuffix()
  34      );
  35  }