= private = protected
acosh(p1)
Computes the inverse hyperbolic cosine of x.
static VALUE math_acosh(VALUE obj, VALUE x) { double d0, d; Need_Float(x); errno = 0; d0 = RFLOAT_VALUE(x); d = acosh(d0); domain_check(d0, d, "acosh"); return DBL2NUM(d); }