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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));

+    }

+}