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On the trigonometric subtraction and addition formulas

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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We solve extensions to groups of the trigonometric addition and subtraction formulas, in which the plus/minus has been replaced by an involutive group automorphism.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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Authors and Affiliations

  1. Department of Mathematics, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark , , , , , , DK

    T. A. Poulsen & H. Stetkær

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  1. T. A. Poulsen
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  2. H. Stetkær
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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

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