Involving csc-1((2(1+z2)1/2/((1+z2)1/2-z))1/2)
Involving csc-1((2(1+z2)1/2/((1+z2)1/2-z))1/2) and cot-1(z)
Involving csc-1((2(1+z2)1/2/((1+z2)1/2-z))1/2) and cot-1(1/z)
