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正弦函数与余弦函数的推广耿济（海南大学，海口５７０２２８）三角函数Ｔ１（ｘ）＝ｃｏｓｘ，Ｔ２（ｘ）＝ｓｉｎｘ是数学上的基本初等函数，具有广泛的应用．中学和大学的数学教材中有许多关于三角函数Ｔ１（ｘ）与Ｔ２（ｘ）的公式和定理．中学数学中重要公式Ｔ２１（...
The promotion of sine function and cosine function Ji Ji (Hainan University, Haikou 570228) The trigonometric function T1(x)=cosx,T2(x)=sinx is a basic elementary function in mathematics and has a wide range of applications. There are many formulas and theorems about the trigonometric functions T1(x) and T2(x) in mathematics textbooks for middle schools and universities. The important formula in high school mathematics T21 (...