$$sinh^{-1}(2) = ln(2 + \sqrt{2^2+1})= ln(2 + \sqrt{5})\approx 1.4436$$ $$tanh^{-1}(1/4) =\frac{1}{2} ln\left(\frac{1 + 1 / 4}{1-1 / 4}\right)=\frac{1}{2}ln\left(\frac{5/4}{3/4}\right)=\frac{1}{2}ln\left(\frac{5}{3}\right)\approx 0.2554$$