(a^2-3)^3-(a-2)(a^2+4)(a+2)
(a^2–3)^3=(a^2)^3+3a^2*(-3)+3*a*(-3)^2+(-3)^3= =a^6-9a^2+27a-27 (a–2)(a^2+4)(a+2)=(a^2+4)*(a-2)*(a+2)= =(a^2+4)*(a^2-4)=(a^2)^2-4^2=a^4-16 (a^2–3)^3–(a–2)(a^2+4)(a+2)= =a^6-9a^2+27a-27-a^4+16=a^6-a^4-9a^2+27a-11