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