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