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vendor/markbaker/complex/classes/src/functions/asec.php

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+<?php
+
+/**
+ *
+ * Function code for the complex asec() 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 secant of a complex number.
+ *
+ * @param     Complex|mixed    $complex    Complex number or a numeric value.
+ * @return    Complex          The inverse secant of the complex argument.
+ * @throws    Exception        If argument isn't a valid real or complex number.
+ * @throws    \InvalidArgumentException    If function would result in a division by zero
+ */
+function asec($complex)
+{
+    $complex = Complex::validateComplexArgument($complex);
+
+    if ($complex->getReal() == 0.0 && $complex->getImaginary() == 0.0) {
+        return INF;
+    }
+
+    return acos(inverse($complex));
+}