Answers: 1
![[x - 1][x - 2][x + 2][x + 1]](/tpl/images/0210/5378/4b033.png)
![[{x}^{4} - {x}^{2}] - [4{x}^{2} + 4] \\ {x}^{2} [{x}^{2} - 1] - 4[{x}^{2} - 1] \\ \\ [{x}^{2} - 4][{x}^{2} - 1] \\ \\ [x - 2][x + 2] {x}^{2} - 4 \\ \\ [{x}^{2} - 1] << [x - 1][x + 1] \\ \\ \\ [x - 1][x - 2][x + 2][x + 1]](/tpl/images/0210/5378/fa8c9.png)
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