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x
 
<!DOCTYPE html>
<html>
<body>
<?php
echo hypot(3,4) . "<br>";
echo hypot(4,6) . "<br>";
echo hypot(1,3) . "<br>";
echo sqrt(3*3+4*4);
?>
</body>
</html>
5
7.211102550928
3.1622776601684
5