From 75160b12821f7f4299cce7f0b69c83c1502ae071 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Anton=20Luka=20=C5=A0ijanec?= <anton@sijanec.eu>
Date: Mon, 27 May 2024 13:08:29 +0200
Subject: 2024-02-19 upstream

---
 .../complex/classes/src/functions/tanh.php         | 37 ++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 vendor/markbaker/complex/classes/src/functions/tanh.php

(limited to 'vendor/markbaker/complex/classes/src/functions/tanh.php')

diff --git a/vendor/markbaker/complex/classes/src/functions/tanh.php b/vendor/markbaker/complex/classes/src/functions/tanh.php
new file mode 100644
index 0000000..8a8ccdc
--- /dev/null
+++ b/vendor/markbaker/complex/classes/src/functions/tanh.php
@@ -0,0 +1,37 @@
+<?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()
+        );
+    }
+}
-- 
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