最佳平方逼近数据逼近我要分享

中文说明：最佳平方逼近数据逼近，正交多项式逼近，勒让德逼近埃尔米特逼近契比雪夫逼近

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English Description：

Best square approximation, data approximation, orthogonal polynomial approximation, Legendre approximation, Hermite approximation, Chebyshev approximation