Involving sec^-1(1-z/1+z)

Involving sec^-1(1-z/1+z) and tan^-1((-z)^1/2)

Involving sec^-1(1-z/1+z) and tan^-1(1/(-z)^1/2)

Involving sec^-1(1-z/1+z) and tan^-1((-1/z)^1/2)