Cosh () PHP Function

Cosh (x) will give you the hyperbolic cosine of x, which can also be calculated as exp(x) + exp(-x))/2, where exp(x) is e raised to the power of x. Here is an example:

<?php
echo(cosh(1) . "<br />");
echo((exp(1) + exp(-1))/2 . "<br />");
?>

Both of these would return 1.5430806348152 as an answer.