#(x-y)(x+y)(x^2+y^2)(x^2+xy+y^2)(x^2-xy+y^2)(x^4-x^2y^2+y^4)#
#(x^2+x y + y^2)=(x^3-y^3)/(x-y)#
#(x^2-x y + y^2)=(x^3+y^3)/(x+y)#
#(x^4-x^2y^2+y^4)=(x^6+y^6)/(x^2+y^2)#
joining all that
#(x-y)(x+y)(x^2+y^2)(x^2+xy+y^2)(x^2-xy+y^2)(x^4-x^2y^2+y^4)=#
#=(x-y)(x+y)(x^2+y^2)(x^3-y^3)/(x-y)(x^3+y^3)/(x+y)(x^6+y^6)/(x^2+y^2)=#
#=(x^3-y^3)(x^3+y^3)(x^6+y^6) = x^12-y^12#