Axiomatizing Trigonometry
Received:December 29, 1991  
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Ying Zhiyi Dept. of Math.
Shanghai Teachers University
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      In this paper, two axioms for cosine function are given and the well-known definitions defined by power series as well as by the arc length on a unit circle have been obtained. Obviously the latter implies both axioms. Thus the two axioms given do constitute a characterization for the cosine function.
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