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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));
+ }
+}