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diff --git a/vendor/markbaker/complex/classes/src/functions/acoth.php b/vendor/markbaker/complex/classes/src/functions/acoth.php
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+++ b/vendor/markbaker/complex/classes/src/functions/acoth.php
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+<?php
+
+/**
+ *
+ * Function code for the complex acoth() function
+ *
+ * @copyright  Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex)
+ * @license    https://opensource.org/licenses/MIT    MIT
+ */
+namespace Complex;
+
+/**
+ * Returns the inverse hyperbolic cotangent of a complex number.
+ *
+ * @param     Complex|mixed    $complex    Complex number or a numeric value.
+ * @return    Complex          The inverse hyperbolic cotangent of the complex argument.
+ * @throws    Exception        If argument isn't a valid real or complex number.
+ * @throws    \InvalidArgumentException    If function would result in a division by zero
+ */
+if (!function_exists(__NAMESPACE__ . '\\acoth')) {
+    function acoth($complex): Complex
+    {
+        $complex = Complex::validateComplexArgument($complex);
+
+        return atanh(inverse($complex));
+    }
+}