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