Find the partial fraction expansion of the rational expression 4z 3322 + 56 + 46 1 z2 -9z 420 [20] Use the partfrac command in Maxima to verify your answer to part (a). Include a screenshot or printout of your Maxima worksheet in your answer. [1] Hence (without using Maxima) find the integral 4z3 3322 4 o R 4] z2 9z + 20