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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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ACOSH(x)
ACOSH function calculates the inverse hyperbolic cosine of @x; that is the value whose hyperbolic cosine is @x. If @x is less than 1.0, ACOSH() returns the #NUM! error.
This function is Excel compatible.
ACOSH(2) equals 1.31696.
ACOSH(5.3) equals 2.35183.
ACOS, ASINH, DEGREES, RADIANS.