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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$e = 0.000001;
$beta = 0.000001;
$a = -1;
$b = 1;
While (abs($b - $a) > $e) {
$x1 = ($a + $b - $beta) / 2;
$x2 = ($a + $b + $beta) / 2;
if ((2*(pow($x1,2)) - exp($x1)) < (2*(pow($x2,2)) - exp($x2))) {
$b = $x2;
}
else if ((2*pow($x1,2) - exp($x1)) > ((2*pow($x2,2)) - exp($x2))) {
$a = $x1;
}
else if ((2*pow($x1,2) - exp($x1)) === ((2*pow($x2,2)) - exp($x2)))
{
$a=$x1;
$b=$x2;
}
}
$x = ($b+$a)/2;
$fx = exp(-$x) - cos($x);
echo "x = $x ; F(x) = $fx;";