fx=1/2sin2x-根号3/2cos2x+1
=sin2xcosπ/3-cos2xsinπ/3+1
=sin(2x-π/3)+1
最小正周期=2π÷2=π
增区间：
2kπ-π/2≤2x-π/3≤2kπ+π/2
2kπ-π/6≤2x≤2kπ+5π/6
kπ-π/12≤x≤kπ+5π/12
即【kπ-π/12,kπ+5π/12】第二步的依据是什么哦sinx在2kπ-π/2≤x≤2kπ+π/2时递增。哪2kπ-π/2和2kπ+π/2是什么意思哦