Involving coth^-1(1-z/2(-z)^1/2)

Involving coth^-1(1-z/2(-z)^1/2) and cot^-1(z^1/2)

Involving coth^-1(1-z/2(-z)^1/2) and cot^-1(1/z^1/2)

Involving coth^-1(1-z/2(-z)^1/2) and cot^-1(1/z^1/2)