在高中数学人教A版(2007年2月第2版)教材中,三角函数被安排在必修4第一章.相对于传统教材,更加突出了“函数是刻画客观世界变化规律的数学模型”这条主线,突出了“三角函数作为描述周期变化的数学模式”这一本质.为了让教材更有利于促进教师创 Triggered by the textbooks of High School Maths A (February 2007, 2nd edition), the trigonometric functions are arranged in the first chapter of Compulsory 4, which is more prominent than the traditional textbooks. The function is a mathematic model for characterizing the changes in the objective world “The main line, highlighting the” trigonometric function as a mathematical model to describe changes in the cycle "In essence, in order to make teaching materials more conducive to the promotion of teachers