由函数y=Asin(ωx+φ)(A>0,ω>0)的图象确定其解析式,是三角函数图象教学中的一个重要组成部分,既是重点又是难点,也是进行逆向思维训练的极好题材,因此在各类考试中常出现φ值的确定和求法.由于函数y=Asin(ωx+φ)(A>0,ω>0)的对应关系是“多对一”的映射,为了突破难点,笔者给 Determining the analytic formula from the image of function y = Asin (ωx + φ) (A> 0, ω> 0) is an important part of the teaching of trigonometrical functions. It is both an important point and a difficult point, Therefore, in all kinds of examinations, the determination and the solution of φ are often found.As the correspondence of function y = Asin (ωx + φ) (A> 0, ω> 0) The mapping, in order to break through the difficulties, I give