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