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一类高幂次的三角数列求和公式徐和郁（浙江普陀中学３１６１００）本文将给出一系列关于正、余弦的高幂次的三角数列的求和公式．先引入两个引理．引理１ｃｏｓｎθ＝１２ｎ∑ｎｋ＝０Ｃｋｎｃｏｓ（ｎ－２ｋ）θ（ｎ∈Ｎ）．证明见文［１］．引理２∑ｎ－１ｔ＝０ｃｏｓ...
The sum formula for a class of high-powered triangular series Xu Heyu (Putuo Middle School 316100, Zhejiang, China) In this paper, a series of sum formulas for the high power triples of positive and cosine are given. First introduce two lemmas. Lemma 1cosnθ=12n∑nk=0Ckncos(n-2k)θ(n∈N). The proof sees [1]. Lemma 2∑n-1t=0cos...