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