Daniel Zwillinger, CRC Standard Mathematical Tables and Formulae, 32nd Edition, CRC Press, 2011, page 219 | Mathematics Across Cultures: The History of Non-western Mathematics |
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A proof for the cosine case appears as Lemma 12 in Bennett, Curtis D | Michael Sullivan, Trigonometry, Dellen Publishing Company, 1988, page 243 |
An accurate elementary mathematical library for the IEEE floating point standard, ACM Transactions on Mathematical Software.
1A History of Mathematics Second ed | , International Symposium on History of Machines and Mechanisms, Springer, 2004 See Maor 1998 , chapter 3, for an earlier etymology crediting Gerard |
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MacTutor History of Mathematics archive | United States National Bureau of 1952 |
Protter, Murray H; Morrey, Charles B | Robert; Halliday, David; Krane, Kenneth S |
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; Nawab, Syed Hamid 1997 | See Katx, Victor July 2008 |