Involving sech^{-1}(1-z/1+z)

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

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

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