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})