m = 1 / 2 * sqrtf(2 * a * a + 2 * b * b - c * c);m = 1.0 / 2 * sqrtf(2 * a * a + 2 * b * b - c * c);res = 180*acos(...)/PI; function my_template_redirect(){
if( is_404() && $_SERVER["REQUEST_URI"] != '/404/' ){
header("HTTP/1.0 404 Not Found");
echo "<script type='text/javascript'> document.location.href = 'http://site.ru/404/'; </script>";
exit();
}
}