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x
 
<!DOCTYPE html>
<html>
<body>
<?php
echo(sin(3) . "<br>");
echo(sin(-3) . "<br>");
echo(sin(0) . "<br>");
echo(sin(M_PI) . "<br>");
echo(sin(M_PI_2));
?>
</body>
</html>
0.14112000805987
-0.14112000805987
0
1.2246467991474E-16
1