PROOF WITHOUT WORDS: SINE DIFFERENCE IDENTITY
In this paper, we give a pictorial proof of sine difference identity.
sine difference identity.
Received: October 21, 2024; Accepted: October 30, 2024; Published: November 13, 2024
How to cite this article: Long Wang, Proof without words: sine difference identity, Far East Journal of Mathematical Education 26(2) (2024), 123-124. http://dx.doi.org/10.17654/0973563124013
This Open Access Article is Licensed under Creative Commons Attribution 4.0 International License
References:[1] R. Nelsen, Proofs Without Words, MAA, Washington DC, 1993, pp. 34-35.[2] Y. Kobayashi, Proofs without words: tangent double angle identity, College Math. J. 44 (2013), 47.[3] L. Wang, Proofs without words: sine sum identity, College Math. J. 45 (2014), 190.[4] L. Wang, Proofs without words: cosine difference identity, College Math. J. 45 (2014), 370.