图像与x轴的交点中相邻的两个交点间的距离为π/2 ,ω = 2
图像上一个最低点为M(2π/3,-2) ,A = 2 ,φ = 3π/4 - 2π/3 = π/12
f(x) = 2sin(2x + π/12)
x∈[π/12 ,π/2]
2x + π/12 ∈ [π/4 ,7π/12]
y ∈ [√2 / 2 ,1]
已知函数f(x)=Asin(ωx+φ,x∈R,A>0,ω>0,0
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