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<!DOCTYPE html>
<html>
<body>
<?php
echo(cosh(3) . "<br>");
echo(cosh(-3) . "<br>");
echo(cosh(0) . "<br>");
echo(cosh(M_PI) . "<br>");
echo(cosh(2*M_PI));
?>
</body>
</html>
10.067661995778
10.067661995778
1
11.591953275522
267.74676148375