Część kodu
$a = $_GET['a']; $b = $_GET['b']; $c = $_GET['c']; $d = $_GET['d']; $e = $_GET['e']; $f = $_GET['f']; $g = $_GET['g']; $h = $_GET['h']; $i = $_GET['i']; $j = $_GET['j']; $k = $_GET['k']; $l = $_GET['l']; $m=($a*$e*$i)+($d*$h*$c)+($g*$b*$f)-($g*$e*$c)-($a*$h*$f)-($d*$b*$i); $n=($j*$e*$i)+($d*$h*$l)+($g*$k*$f)-($g*$e*$l)-($j*$h*$f)-($d*$k*$i); $o=($a*$k*$i)+($j*$h*$c)+($g*$b*$l)-($g*$k*$c)-($a*$h*$l)-($j*$b*$i); $p=($a*$e*$l)+($d*$k*$c)+($j*$b*$f)-($j*$e*$c)-($a*$k*$f)-($d*$b*$l); $t=$m; $u=$n; $w=$o; $x=$p; $q=$u/$t; $r=$w/$t; $s=$x/$t; header("Content-type: text/xml"); echo("<?xml version=\"1.0\" encoding=\"utf-8\"?>"); echo("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN\" \"mathml-entities.dtd\">");