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