2026/108/3-4 (12)
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DOI: 10.5486/PMD.2026.10394
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pp. 499-511
On alienation of the sine and cosine addition formulas on semigroups
Authors:
Bruce Ebanks 
Abstract:
We answer two alienation questions involving the cosine and sine addition formulas on a semigroup. The findings in both cases reveal a large degree of dependence between these two functional equations.
Keywords: alienation, sine addition law, cosine addition law, semigroups
Mathematics Subject Classification: 39B52, 39B82, 39B32