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{math.tan.hyperbolic.inverse(Float $number)}
{matg.tan.hyperbolic.inverse()} Returns the inverse hyperbolic tangent of number, i.e. the value whose hyperbolic tangent is number.
Returns The inverse hyperbolic tangent of
numberas afloat.
https://www.php.net/manual/en/function.atanh.php
Last modified: 2021-06-06
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