Involving csc-1((-z2)1/2/(a-z2)1/2)
Involving csc-1((-z2)1/2/(1-z2)1/2) and cosh-1(1/z)
Involving csc-1((-z2)1/2/(-1-z2)1/2) and cosh-1(z2+2/z2)
Involving csc-1((-z2)1/2/(-1-z2)1/2) and cosh-1((1+1/z2)1/2)