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Generalised trigonometry. (English)
Math. Spectr. 44, No. 3, 102-110 (2012).
Summary: A comprehensive treatment is developed of how trigonometry becomes modified when the right angle present in the basic triangle of conventional trigonometry is replaced by some other constant (but arbitrary) angle $σ$. The relationship between this generalised trigonometry and the conventional version is explored in some detail.
Classification: G60
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