Tryit Editor v2.3

PHP Source:

<!DOCTYPE html>
<html>
<body>

<?php
echo(atan(0.50) . " ");
echo(atan(-0.50) . " ");
echo(atan(5) . " ");
echo(atan(-5) . " ");
echo(atan(100) . " ");
echo(atan(-100));
?>

</body>
</html>