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Long Term Support Release

  • Bug fixes for general core bugs in 3.9.x will end* 10 May 2021 (12 months).
  • Bug fixes for security issues in 3.9.x will end* 8 May 2023 (36 months).
  • PHP version: minimum PHP 7.2.0 Note: minimum PHP version has increased since Moodle 3.8. PHP 7.3.x and 7.4.x are supported too.
<?php

/**
 *
 * Function code for the complex tan() function
 *
 * @copyright  Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex)
 * @license    https://opensource.org/licenses/MIT    MIT
 */
namespace Complex;

/**
 * Returns the tangent of a complex number.
 *
 * @param     Complex|mixed    $complex    Complex number or a numeric value.
 * @return    Complex          The tangent of the complex argument.
 * @throws    Exception        If argument isn't a valid real or complex number.
 * @throws    \InvalidArgumentException    If function would result in a division by zero
 */
< function tan($complex)
> function tan($complex): Complex
{ $complex = Complex::validateComplexArgument($complex); if ($complex->isReal()) { return new Complex(\tan($complex->getReal())); } $real = $complex->getReal(); $imaginary = $complex->getImaginary(); $divisor = 1 + \pow(\tan($real), 2) * \pow(\tanh($imaginary), 2); if ($divisor == 0.0) { throw new \InvalidArgumentException('Division by zero'); } return new Complex( \pow(sech($imaginary)->getReal(), 2) * \tan($real) / $divisor, \pow(sec($real)->getReal(), 2) * \tanh($imaginary) / $divisor, $complex->getSuffix() ); }