In the trigonometric function model, we will encounter trigonometric functions like y=Asin(ωx+φ). The sine image A of trigonometric function is the amplitude of simple harmonic motion, which is the maximum distance from the equilibrium position of the object making simple harmonic motion. The period of simple harmonic vibration is T=2π/ω, the frequency of simple harmonic vibration is called phase, and the formula is f= 1/T=ω/2π ωx+φ. The phase (ω x+φ = φ) when x = 0 is called the initial phase. (The premise of the initial stage is (. 0，ω& gt； 0), if one of them is not, it can be transformed by inductive formula to meet the above conditions. )