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请问大家这个等式怎么证明? - 知乎
source link: https://www.zhihu.com/question/323053752/answer/677122989
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这个不难，不用Chebyshev多项式也可以做注意到 我们容易得到 所以我们只用把 代入方程 得到 通过韦达…
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