(PHP 4 >= 4.1.0, PHP 5, PHP 7)
Inverse hyperbolic cosine
float acosh ( float $arg )
Returns the inverse hyperbolic cosine of arg
, i.e. the value whose hyperbolic cosine is arg
.
Parameters:
arg
The value to process
Returns:
The inverse hyperbolic cosine of arg
Changelog:
5.3.0
This function is now available on all platforms
See also:
cosh() -
acos() -
asinh() -
atanh() -
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