Involving csc-1(z1/2/(z+a)1/2)
Involving csc-1(z1/2/(z-1)1/2) and sech-1(z1/2)
Involving csc-1(z1/2/(z+1)1/2) and sech-1(z/z+2)
Involving csc -1(z1/2/(z+1)1/2) and sech-1(z/z+11/2)