A = 2 w = 2
f(x) = 2sin2x
x ∈ [kπ - π/4 ,kπ + π/4],f(x) = 2sin2x 为增函数
x ∈ [kπ + π/4 ,kπ + 3π/4],f(x) = 2sin2x 为减函数
f(α/2)=1,a∈ (0,π/2)
2sinα= 1
α= π/6
cosα = √3/2
tanα = √3/3
A = 2 w = 2
f(x) = 2sin2x
x ∈ [kπ - π/4 ,kπ + π/4],f(x) = 2sin2x 为增函数
x ∈ [kπ + π/4 ,kπ + 3π/4],f(x) = 2sin2x 为减函数
f(α/2)=1,a∈ (0,π/2)
2sinα= 1
α= π/6
cosα = √3/2
tanα = √3/3