Summary.
We solve extensions to groups of the trigonometric addition and subtraction formulas, in which the plus/minus has been replaced by an involutive group automorphism. The groups need not be abelian.
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Received: April 14, 1998.
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Poulsen, T., Stetkær, H. On the trigonometric subtraction and addition formulas. Aequ. math. 59, 84–92 (2000). https://doi.org/10.1007/PL00000130
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DOI: https://doi.org/10.1007/PL00000130