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)