Involving sec-1((-z2)1/2/(a-z2)1/2)
Involving sec-1((-z2)1/2/(1-z2)1/2) and sech-1(z)
Involving sec-1((-z2)1/2/(-1-z2)1/2) and sech-1(z2/z2+2)
Involving sec-1((-z2)1/2/(-1-z2)1/2) and sech-1(z2/z2+11/2)