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