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diff --git a/vendor/markbaker/complex/classes/src/functions/argument.php b/vendor/markbaker/complex/classes/src/functions/argument.php
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+++ b/vendor/markbaker/complex/classes/src/functions/argument.php
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+<?php
+
+/**
+ *
+ * Function code for the complex argument() function
+ *
+ * @copyright  Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex)
+ * @license    https://opensource.org/licenses/MIT    MIT
+ */
+namespace Complex;
+
+/**
+ * Returns the argument of a complex number.
+ * Also known as the theta of the complex number, i.e. the angle in radians
+ *   from the real axis to the representation of the number in polar coordinates.
+ *
+ * This function is a synonym for theta()
+ *
+ * @param     Complex|mixed    $complex    Complex number or a numeric value.
+ * @return    float            The argument (or theta) value of the complex argument.
+ * @throws    Exception        If argument isn't a valid real or complex number.
+ *
+ * @see    theta
+ */
+if (!function_exists(__NAMESPACE__ . '\\argument')) {
+    function argument($complex): float
+    {
+        return theta($complex);
+    }
+}