[질문] (a-2d)*(a-d)*(a)*(a+d)*(a+2d)는??

(a-2d)*(a-d)*(a)*(a+d)*(a+2d)=a네제곱+3a네제곱b+4a제곱b제곱-3a세제곱b-9a세제곱b제곱-12ab세제곱+2a제곱b제곱+6a제곱b세제곱+8b네제곱입니다*^-^*!