Involving sech^{-1}((z-1)^{1/2}/z^{1/2})
Involving sech^{-1}((z-1)^{1/2}/z^{1/2}) and tanh^{-1}(z^{1/2})
Involving sech^{-1}((z-1)^{1/2}/z^{1/2}) and tanh^{-1}(1/z^{1/2})