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