PHP Source:
<
!DOCTYPE
html
>
<
html
>
<
body
>
<?php
echo
(acos(
0.64
) .
"<br>"
);
echo
(acos(-
0.4
) .
"<br>"
);
echo
(acos(
0
) .
"<br>"
);
echo
(acos(-
1
) .
"<br>"
);
echo
(acos(
1
) .
"<br>"
);
echo
(acos(
2
));
?>
<
/body
>
<
/html
>
Result:
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