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

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

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