Available in all subroutines.
Computes the hyperbolic sine of its argument
x - Floating point value representing a hyperbolic angle.
Upon successful completion, this function returns the hyperbolic sine of
math.NAN, a NaN will be returned.
x is subnormal, a range error occurs and
x will be returned.
x argument is subnormal or if the result would cause an overflow, then
fastly.error will be set to
declare local var.fo FLOAT;set var.fo = math.sinh(-1);
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