Involving sec-1((2(z2-1)1/2/((z2-1)1/2-z))1/2)
Involving sec-1((2(z2-1)1/2/((z2-1)1/2-z))1/2) and coth-1(z)
Involving sec-1((2(z2-1)1/2/((z2-1)1/2-z))1/2) and coth-1(1/z)