Sửa đề: \(\left(x^2-2x+2\right)\left(x^2+2x+2\right)\left(x^2-2\right)\left(x^2+2\right)\)
Ta có: \(\left(x^2-2x+2\right)\left(x^2+2x+2\right)\left(x^2-2\right)\left(x^2+2\right)\)
\(=\left[\left(x^2+2\right)^2-4x^2\right]\left(x^4-4\right)\)
\(=\left(x^4+4x^2+4-4x^2\right)\left(x^4-4\right)\)
\(=\left(x^4+4\right)\left(x^4-4\right)\)
\(=x^8-16\)