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📄 abs.phpEdit
📄 acos.phpEdit
📄 acosh.phpEdit
📄 acot.phpEdit
📄 acoth.phpEdit
📄 acsc.phpEdit
📄 acsch.phpEdit
📄 argument.phpEdit
📄 asec.phpEdit
📄 asech.phpEdit
📄 asin.phpEdit
📄 asinh.phpEdit
📄 atan.phpEdit
📄 atanh.phpEdit
📄 conjugate.phpEdit
📄 cos.phpEdit
📄 cosh.phpEdit
📄 cot.phpEdit
📄 coth.phpEdit
📄 csc.phpEdit
📄 csch.phpEdit
📄 exp.phpEdit
📄 inverse.phpEdit
📄 ln.phpEdit
📄 log10.phpEdit
📄 log2.phpEdit
📄 negative.phpEdit
📄 pow.phpEdit
📄 rho.phpEdit
📄 sec.phpEdit
📄 sech.phpEdit
📄 sin.phpEdit
📄 sinh.phpEdit
📄 sqrt.phpEdit
📄 tan.phpEdit
📄 tanh.phpEdit
📄 theta.phpEdit

Edit File: acos.php

<?php

/**
 *
 * Function code for the complex acos() 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 cosine of a complex number.
 *
 * @param     Complex|mixed    $complex    Complex number or a numeric value.
 * @return    Complex          The inverse cosine of the complex argument.
 * @throws    Exception        If argument isn't a valid real or complex number.
 */
function acos($complex)
{
    $complex = Complex::validateComplexArgument($complex);

$square = clone $complex;
    $square = multiply($square, $complex);
    $invsqrt = new Complex(1.0);
    $invsqrt = subtract($invsqrt, $square);
    $invsqrt = sqrt($invsqrt);
    $adjust = new Complex(
        $complex->getReal() - $invsqrt->getImaginary(),
        $complex->getImaginary() + $invsqrt->getReal()
    );
    $log = ln($adjust);

return new Complex(
        $log->getImaginary(),
        -1 * $log->getReal()
    );
}

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Edit File: acos.php