12.10.40 Hyperbolic arc cosine

Unsafe Operation: $acosh-fixnum fx

Compute the inverse hyperbolic cosine of fx; return a flonum, compnum or cflonum.

Unsafe Operation: $acosh-bignum bn

Compute the inverse hyperbolic cosine of bn; return a flonum, compnum or cflonum.

Unsafe Operation: $acosh-ratnum rt

Compute the inverse hyperbolic cosine of rt; return a flonum, compnum or cflonum.

Unsafe Operation: $acosh-flonum fl

Compute the inverse hyperbolic cosine of fl; return a flonum, compnum or cflonum. This is different from $flacosh whose return value is a flonum begin +nan.0 when the operand is out of the domain for real numbers.

Unsafe Operation: $acosh-compnum cn

Compute the inverse hyperbolic cosine of cn; return a number object.

Unsafe Operation: $acosh-cflonum cfl

Compute the inverse hyperbolic cosine of cfl; return a cflonum.