Involving coth^{-1}(z/(1+z^{2})^{1/2}+a)

Involving coth^{-1}(z/(1+z^{2})^{1/2}+1) and cos^{-1}(i z)

Involving coth^{-1}(z/(1+z^{2})^{1/2}-1) and cos^{-1}(i z)