A polynomial approximation algorithm for the problem is given.
同时，还给出了该问题的多项式时间近似算法。
The general methods are polynomial approximation and Chebyshev approximation.
常见的方法有多项式逼近，切比雪夫多项式逼近。
The polynomial approximation method is also employed to obtain simple formulas for frequency and amplitude correction.
本文利用多项式逼近方法获得了频率和幅值修正的计算公式。
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