12.10.41 Hyperbolic arc tangent

Unsafe Operation: $atanh-fixnum fx

Compute the inverse hyperbolic tangent of fx; return a flonum or cflonum.

Unsafe Operation: $atanh-bignum bn

Compute the inverse hyperbolic tangent of bn; return a flonum or cflonum.

Unsafe Operation: $atanh-ratnum rt

Compute the inverse hyperbolic tangent of rt; return a flonum or cflonum.

Unsafe Operation: $atanh-flonum fl

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

Unsafe Operation: $atanh-compnum cn

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

Unsafe Operation: $atanh-cflonum cfl

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