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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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ATANH(x)
ATANH function calculates the inverse hyperbolic tangent of @x; that is the value whose hyperbolic tangent is @x. If the absolute value of @x is greater than 1.0, ATANH returns #NUM! error.
This function is Excel compatible.
ATANH(0.5) equals 0.549306.
ATANH(0.8) equals 1.098612.
ATAN, TAN, SIN, COS, DEGREES, RADIANS.