Available in all subroutines.
Computes the inverse hyperbolic cosine of its argument
x - Floating point value representing the area of a hyperbolic sector.
Upon successful completion, this function returns the inverse hyperbolic
math.NAN, a NaN will be returned.
x is +1, +0 will be returned.
a domain error occurs and a NaN will be returned.
For finite values of
x < 1, a domain error occurs and a NaN will be returned.
declare local var.fo FLOAT;set var.fo = math.acosh(10);
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