已知函数f(x)=4sin^2x+2cos(2x-π/3).(1)若存在x0∈[π/4,2π/3],使mf(x0)-4=0成立,求实数m的取值范围;(2)若x∈[0,π/2],f(x)=5/2,求sin2x的值

问题描述:

已知函数f(x)=4sin^2x+2cos(2x-π/3).(1)若存在x0∈[π/4,2π/3],使mf(x0)-4=0成立,求实数m的取值范围;(2)若x∈[0,π/2],f(x)=5/2,求sin2x的值

x0∈[π/4,2π/f(x)=4sin^2x+2cos(2x-π/3).(3],使mfx∈[0,π/2],f(x)=5/2(x0)-4=0