已知集合A={x|π/4
问题描述：
已知集合A={x|π/4
答
f(x)=4sin^2(π/4+x)-2√3cos2x-1
f(x)=2[1-cos(π/2+2x)]-2√3cos2x-1
=2sin2x-2√3cos2x+1
=4sin(2x-π/3)+1
π/4