BAI Shui-zhou. The Proof of Two Trigonometric Identity[J]. Journal of Yellow River Conservancy Technical Institute, 2001, 13(4): 40-43. DOI: 10.13681/j.cnki.cn41-1282/tv.2001.04.016
Citation:
BAI Shui-zhou. The Proof of Two Trigonometric Identity[J]. Journal of Yellow River Conservancy Technical Institute, 2001, 13(4): 40-43. DOI: 10.13681/j.cnki.cn41-1282/tv.2001.04.016
BAI Shui-zhou. The Proof of Two Trigonometric Identity[J]. Journal of Yellow River Conservancy Technical Institute, 2001, 13(4): 40-43. DOI: 10.13681/j.cnki.cn41-1282/tv.2001.04.016
Citation:
BAI Shui-zhou. The Proof of Two Trigonometric Identity[J]. Journal of Yellow River Conservancy Technical Institute, 2001, 13(4): 40-43. DOI: 10.13681/j.cnki.cn41-1282/tv.2001.04.016
The article, A Trigonometric Series Formular about Combinatorial Numbers, written by Wang Qin-guo and published in Mathematics Bulletin （No.2,1982）, presented some trigonometic identity and pointed out that these were difficult to be proved by other methods. This paper gives the new methods to prove them and the proof process isn’t complex.
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