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