已知函数f(x)=2sin(wx+θ)(w>0,0<θ<π)的最小正周期为π,且f(π/4)=...已知函数f(x)=2sin(wx+θ)(w>0,0<θ<π)的最小正周期为π,且f(π/4)=根号2.(1)求w,θ的值,(2)若f(α/2)=-6/5,求cos2α
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