(PHP 4 >= 4.1.0, PHP 5, PHP 7)
cosh — Hyperbolic cosine
cosh ( float $arg ) : float
Returns the hyperbolic cosine of arg
, defined as (exp(arg) + exp(-arg))/2
.
arg
The argument to process
The hyperbolic cosine of arg
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https://www.php.net/manual/en/function.cosh.php