i have two pairs of shoes and i want to buy a () pair 用 three怎样改加进括号里

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• 求多项式x＾n-1在复数域和实数域内的因式分解.我不明白实数域上怎么分解的啊?看个答案将共轭虚根放在一起不明白怎么弄得那么多式子!将上面的共轭虚根放在一起就得到实数域上的分解：n是奇数时 x^n-1=(x-1)(x^2-2cos(t)x+1)(x^2-2cos(2t)x+1)...(x^2-2cos((n-1)t/2)x+1)n是偶数时 x^n-1=(x-1)(x^2-2cos(t)x+1)(x^2-2cos(2t)x+1)...(x^2-2cos((n/2-1)t)x+1)(x+1)