International Journal of Statistics and Applied Mathematics
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International Journal of Statistics and Applied Mathematics

2018, Vol. 3, Issue 1, Part B

The proof of trigonometric formula for the sum and difference of the two angles by Ptolemy's theorem


Author(s): Xintong Yang

Abstract: The trigonometric formula for the sum and difference of two angles is an important set of formulas in senior high school mathematics. Based on the proof of the sine formula of two angles provided by former researchers, we gave the proofs of they other three formulas with the Ptolemy's theorem. These proof contributed to the teaching and learning of senior high school mathematics teachers and students.

Pages: 98-100 | Views: 525 | Downloads: 21

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How to cite this article:
Xintong Yang. The proof of trigonometric formula for the sum and difference of the two angles by Ptolemy's theorem. Int J Stat Appl Math 2018;3(1):98-100.
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International Journal of Statistics and Applied Mathematics