упростите (a^2-3)^3-(a-2)(a^2+4)(a+2)

(a²-3)³-(a-2)(a²+4)(a+2)=a^6-9a^4+27a²-27-(a²-4)(a²+4)=a^6-9a^4+27a²-27-(a^4-256)=a^6-9a^4+27a²-27-a^4+256=a^6-10a^4+27a²+229(a²-3)³=a^6-3a^4*3+3a²*3²-3³=a^6-9a^4+27a²-27(a-2)(a+2)=a²-2²=a²-4(a²-4)(a²+4)=a^4-4^4=a^4-256