(2x-y)(4x+2xy+y^2)(8x^3+y3)
(X-2)^3-(x+2)^3
(A^6-3a^3+9)(a^3+3)-a^9
(A+3)^3-(a-1)^3-12a^2

(2x-y)(4x²+2y+y²)(8x³+y³)=(8x³-y³)(8x³+y³) = 64x⁶-y⁶(x-2)³ - (x+2)³ = x³-6x²+12x-8-x³-6x²-12x-8=-12x²-16(a⁶-3a³+9)(a³+3)-a⁹=a⁹+27-a⁹=27(a+3)³-(a-1)³-12a²=a³+9a²+27a+27-a³+3a²-3a+1-12a²=24a+28