Involving sin-1(((1+z2)1/2-1)1/2/(21/2(1+z2)1/4))
Involving sin-1(((1+z2)1/2-1)1/2/(21/2(1+z2)1/4)) and tan-1(z)
Involving sin-1(((1+z2)1/2-1)1/2/(21/2 (1+z2)1/4)) and tan-1(1/z)