Involving coth^-1(z/(1-z²)^1/2+a)

Involving coth^-1(z/(1-z²)^1/2+1) and tanh^-1(z)

Involving coth^-1(z/(1-z²)^1/2+1) and tanh^-1(1/z)

Involving coth^-1(z/(1-z²)^1/2-1) and tanh^-1(z)

Involving coth^-1(z/(1-z²)^1/2-1) and tanh^-1(1/z)