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Trigonometry without right angles. (English)
Math. Spectr. 44, No. 3, 98-101 (2012).
Summary: This article describes how trigonometric functions can be defined for non-right-angled triangles. In particular, the ratios esin, ecos, and etan, corresponding to the sine, cosine, and tangent ratios, are defined for triangles containing a $π/3$ angle. Some of the implications are discussed, including the graphs of these functions and the small-angle approximations.
Classification: G60
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