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b) (x^2-xy+xz-yx+y^2-yz+ax-ay+az)(x+y)=x^3+x^2y-x^2y-y^2x+x^2z+xzy-yx^2-y^2x+y^2x+y^3-yxz-y^2z+ax^2+axy-ayx-ay^2+azx+azy