发布网友 发布时间:2024-10-23 20:42
共1个回答
热心网友 时间:2024-11-10 21:25
很显然A=2
(3/4)T=2π/3-(-π/12)
∴T=π
ω=2π/T=2
∴f(x)=2sin(2x+φ)
将(-π/12,-2)代入得
sin(-π/6+φ)=-1
-π/6+φ=-π/2+2kπ,k∈Z
∴φ=-π/3+2kπ,k∈Z
f(x)=2sin(2x-π/3+2kπ)=2sin(2x-π/3)
f(π/2)=2sin(π-π/3)=2sin(2π/3)=√3
选B
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