The order of integration was given to be that way too. I tried splitting the denominator and using partial fractions, but I could not find a way to split it since. Since the 1 is at the end, and the beginning, the only option are (z-1)(z+1)(-z+1)(-z-1) With that, there isn't a way to get 48z. In addition, the z^2 factors must get rid of each other.