(a2+2a+2)(a2−2a+2)\left(a^{2}+2 a+2\right)\left(a^{2}-2 a+2\right) (a2+2a+2)(a2−2a+2)
(a2+2a+2)(a2−2a−2)\left(a^{2}+2 a+2\right)\left(a^{2}-2 a-2\right) (a2+2a+2)(a2−2a−2)
(a2−2a+2)(a2+2a−2)\left(a^{2}-2 a+2\right)\left(a^{2}+2 a-2\right) (a2−2a+2)(a2+2a−2)
(a2−2a−2)(a2−2a+2)\left(a^{2}-2 a-2\right)\left(a^{2}-2 a+2\right)(a2−2a−2)(a2−2a+2)