Involving tanh^{-1}(z)

Involving tanh^{-1}(z) and cot^{-1}(i z)

Involving tanh^{-1}(z) and cot^{-1}(-i z)

Involving tanh^{-1}(z) and cot^{-1}(i/z)

Involving tanh^{-1}(z) and cot^{-1}(-i/z)