<?php
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/**
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*
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* Function code for the complex asec() function
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*
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* @copyright Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex)
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* @license https://opensource.org/licenses/MIT MIT
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*/
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namespace Complex;
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/**
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* Returns the inverse secant of a complex number.
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*
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* @param Complex|mixed $complex Complex number or a numeric value.
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* @return Complex The inverse secant of the complex argument.
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* @throws Exception If argument isn't a valid real or complex number.
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* @throws \InvalidArgumentException If function would result in a division by zero
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*/
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function asec($complex)
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{
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$complex = Complex::validateComplexArgument($complex);
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if ($complex->getReal() == 0.0 && $complex->getImaginary() == 0.0) {
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return INF;
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}
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return acos(inverse($complex));
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}
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