Available in all subroutines.
Computes the hyperbolic cosine of its argument
x - Floating point value representing a hyperbolic angle.
Upon successful completion, this function returns the hyperbolic cosine of
math.NAN, a NaN will be returned.
x is ±0, the value 1.0 will be returned.
If the result would cause an overflow, then
fastly.error will be set to
declare local var.fo FLOAT;set var.fo = math.cosh(0);
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